diff --git a/Pipfile.lock b/Pipfile.lock
index 64cdede..5ffef10 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -22,6 +22,7 @@
                 "sha256:6279836d581513a26f1bf235f9acd333bc9115683f14f7e8fae46c98fc50e015"
             ],
             "index": "pypi",
+            "markers": "python_version >= '3.7'",
             "version": "==23.1.0"
         },
         "beautifulsoup4": {
@@ -30,30 +31,31 @@
                 "sha256:bd2520ca0d9d7d12694a53d44ac482d181b4ec1888909b035a3dbf40d0f57d4a"
             ],
             "index": "pypi",
+            "markers": "python_full_version >= '3.6.0'",
             "version": "==4.12.2"
         },
         "boto3": {
             "hashes": [
-                "sha256:2ccbea42fe4cbd22a8ba1e90a37ac65f05c1932e63432e429fb7158d8255bbc0",
-                "sha256:4713a4e69120db5f358f4d378459fb4ea04be98664a0908088f6e04ab49d2583"
+                "sha256:ca9b04fc2c75990c2be84c43b9d6edecce828960fc27e07ab29036587a1ca635",
+                "sha256:d1135647309b89376a014d21407aabfa322998206175f2297def812bf4d824a9"
             ],
-            "version": "==1.28.34"
+            "version": "==1.29.4"
         },
         "botocore": {
             "hashes": [
-                "sha256:23ba9e3a8b4c0e5966bbe2db62edb27f61e16b846f153f22aefda7b3c05c7942",
-                "sha256:456ef8eb458db35b8643eb10e652ed50750d13e5af431593471b2c705c34b5db"
+                "sha256:3ee73c0d93bdb944d0c46772f08f09cdcf25ef58bd86962e6f4a24e531198bfa",
+                "sha256:6bfa75e28c9ad0321cefefa51b00ff233b16b2416f8b95229796263edba45a39"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==1.31.34"
+            "version": "==1.32.4"
         },
         "certifi": {
             "hashes": [
-                "sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082",
-                "sha256:92d6037539857d8206b8f6ae472e8b77db8058fec5937a1ef3f54304089edbb9"
+                "sha256:9b469f3a900bf28dc19b8cfbf8019bf47f7fdd1a65a1d4ffb98fc14166beb4d1",
+                "sha256:e036ab49d5b79556f99cfc2d9320b34cfbe5be05c5871b51de9329f0603b0474"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==2023.7.22"
+            "version": "==2023.11.17"
         },
         "click": {
             "hashes": [
@@ -61,6 +63,7 @@
                 "sha256:ca9853ad459e787e2192211578cc907e7594e294c7ccc834310722b41b9ca6de"
             ],
             "index": "pypi",
+            "markers": "python_version >= '3.7'",
             "version": "==8.1.7"
         },
         "jmespath": {
@@ -167,6 +170,7 @@
                 "sha256:fe4bda6bd4340caa6e5cf95e73f8fea5c4bfc55763dd42f1b50a94c1b4a2fbd4"
             ],
             "index": "pypi",
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
             "version": "==4.9.3"
         },
         "python-dateutil": {
@@ -175,23 +179,24 @@
                 "sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9"
             ],
             "index": "pypi",
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.8.2"
         },
         "s3transfer": {
             "hashes": [
-                "sha256:b014be3a8a2aab98cfe1abc7229cc5a9a0cf05eb9c1f2b86b230fd8df3f78084",
-                "sha256:cab66d3380cca3e70939ef2255d01cd8aece6a4907a9528740f668c4b0611861"
+                "sha256:10d6923c6359175f264811ef4bf6161a3156ce8e350e705396a7557d6293c33a",
+                "sha256:fd3889a66f5fe17299fe75b82eae6cf722554edca744ca5d5fe308b104883d2e"
             ],
             "markers": "python_version >= '3.7'",
-            "version": "==0.6.2"
+            "version": "==0.7.0"
         },
         "sentry-sdk": {
             "hashes": [
-                "sha256:3e17215d8006612e2df02b0e73115eb8376c37e3f586d8436fa41644e605074d",
-                "sha256:a99ee105384788c3f228726a88baf515fe7b5f1d2d0f215a03d194369f158df7"
+                "sha256:25d574f94fdf72199e331c2401fdac60d01b5be8f32822174c51c3ff0fc2f8cb",
+                "sha256:f32dd16547f2f45e1c71a96fd4a48925e629541f7ddfe3d5d25ef7d5e94eb3c8"
             ],
             "index": "pypi",
-            "version": "==1.29.2"
+            "version": "==1.36.0"
         },
         "six": {
             "hashes": [
@@ -206,19 +211,19 @@
                 "s3"
             ],
             "hashes": [
-                "sha256:b4c9ae193ad6d3e7add50944b86afa0d150bd821ab8ec21edb26d9a06b66f6a8",
-                "sha256:d5238825fe9a9340645fac3d75b287c08fbb99fb2b422477de781c9f5f09e019"
+                "sha256:8d3ef7e6997e8e42dd55c74166ed21e6ac70664caa32dd940b26d54a8f6b4142",
+                "sha256:be3c92c246fbe80ebce8fbacb180494a481a77fcdcb7c1aadb2ea5b9c2bee8b9"
             ],
-            "index": "pypi",
-            "version": "==6.3.0"
+            "markers": "python_version >= '3.6' and python_version < '4.0'",
+            "version": "==6.4.0"
         },
         "soupsieve": {
             "hashes": [
-                "sha256:1c1bfee6819544a3447586c889157365a27e10d88cde3ad3da0cf0ddf646feb8",
-                "sha256:89d12b2d5dfcd2c9e8c22326da9d9aa9cb3dfab0a83a024f05704076ee8d35ea"
+                "sha256:5663d5a7b3bfaeee0bc4372e7fc48f9cff4940b3eec54a6451cc5299f1097690",
+                "sha256:eaa337ff55a1579b6549dc679565eac1e3d000563bcb1c8ab0d0fefbc0c2cdc7"
             ],
-            "markers": "python_version >= '3.7'",
-            "version": "==2.4.1"
+            "markers": "python_version >= '3.8'",
+            "version": "==2.5"
         },
         "types-python-dateutil": {
             "hashes": [
@@ -230,11 +235,11 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:8d36afa7616d8ab714608411b4a3b13e58f463aee519024578e062e141dce20f",
-                "sha256:8f135f6502756bde6b2a9b28989df5fbe87c9970cecaa69041edcce7f0589b14"
+                "sha256:c97dfde1f7bd43a71c8d2a58e369e9b2bf692d1334ea9f9cae55add7d0dd0f84",
+                "sha256:fdb6d215c776278489906c2f8916e6e7d4f5a9b602ccbcfdf7f016fc8da0596e"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==1.26.16"
+            "version": "==2.0.7"
         }
     },
     "develop": {
@@ -248,17 +253,10 @@
         },
         "asttokens": {
             "hashes": [
-                "sha256:4622110b2a6f30b77e1473affaa97e711bc2f07d3f10848420ff1898edbe94f3",
-                "sha256:6b0ac9e93fb0335014d382b8fa9b3afa7df546984258005da0b9e7095b3deb1c"
-            ],
-            "version": "==2.2.1"
-        },
-        "backcall": {
-            "hashes": [
-                "sha256:5cbdbf27be5e7cfadb448baf0aa95508f91f2bbc6c6437cd9cd06e2a4c215e1e",
-                "sha256:fbbce6a29f263178a1f7915c1940bde0ec2b2a967566fe1c65c1dfb7422bd255"
+                "sha256:051ed49c3dcae8913ea7cd08e46a606dba30b79993209636c4875bc1d637bc24",
+                "sha256:b03869718ba9a6eb027e134bfdf69f38a236d681c83c160d510768af11254ba0"
             ],
-            "version": "==0.2.0"
+            "version": "==2.4.1"
         },
         "bandit": {
             "hashes": [
@@ -266,124 +264,137 @@
                 "sha256:bdfc739baa03b880c2d15d0431b31c658ffc348e907fe197e54e0389dd59e11e"
             ],
             "index": "pypi",
+            "markers": "python_version >= '3.7'",
             "version": "==1.7.5"
         },
         "black": {
             "hashes": [
-                "sha256:01ede61aac8c154b55f35301fac3e730baf0c9cf8120f65a9cd61a81cfb4a0c3",
-                "sha256:022a582720b0d9480ed82576c920a8c1dde97cc38ff11d8d8859b3bd6ca9eedb",
-                "sha256:25cc308838fe71f7065df53aedd20327969d05671bac95b38fdf37ebe70ac087",
-                "sha256:27eb7a0c71604d5de083757fbdb245b1a4fae60e9596514c6ec497eb63f95320",
-                "sha256:327a8c2550ddc573b51e2c352adb88143464bb9d92c10416feb86b0f5aee5ff6",
-                "sha256:47e56d83aad53ca140da0af87678fb38e44fd6bc0af71eebab2d1f59b1acf1d3",
-                "sha256:501387a9edcb75d7ae8a4412bb8749900386eaef258f1aefab18adddea1936bc",
-                "sha256:552513d5cd5694590d7ef6f46e1767a4df9af168d449ff767b13b084c020e63f",
-                "sha256:5c4bc552ab52f6c1c506ccae05681fab58c3f72d59ae6e6639e8885e94fe2587",
-                "sha256:642496b675095d423f9b8448243336f8ec71c9d4d57ec17bf795b67f08132a91",
-                "sha256:6d1c6022b86f83b632d06f2b02774134def5d4d4f1dac8bef16d90cda18ba28a",
-                "sha256:7f3bf2dec7d541b4619b8ce526bda74a6b0bffc480a163fed32eb8b3c9aed8ad",
-                "sha256:831d8f54c3a8c8cf55f64d0422ee875eecac26f5f649fb6c1df65316b67c8926",
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-                "sha256:86cee259349b4448adb4ef9b204bb4467aae74a386bce85d56ba4f5dc0da27be",
-                "sha256:893695a76b140881531062d48476ebe4a48f5d1e9388177e175d76234ca247cd",
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-                "sha256:f9062af71c59c004cd519e2fb8f5d25d39e46d3af011b41ab43b9c74e27e236f",
-                "sha256:fb074d8b213749fa1d077d630db0d5f8cc3b2ae63587ad4116e8a436e9bbe995"
+                "sha256:250d7e60f323fcfc8ea6c800d5eba12f7967400eb6c2d21ae85ad31c204fb1f4",
+                "sha256:2a9acad1451632021ee0d146c8765782a0c3846e0e0ea46659d7c4f89d9b212b",
+                "sha256:412f56bab20ac85927f3a959230331de5614aecda1ede14b373083f62ec24e6f",
+                "sha256:421f3e44aa67138ab1b9bfbc22ee3780b22fa5b291e4db8ab7eee95200726b07",
+                "sha256:45aa1d4675964946e53ab81aeec7a37613c1cb71647b5394779e6efb79d6d187",
+                "sha256:4c44b7211a3a0570cc097e81135faa5f261264f4dfaa22bd5ee2875a4e773bd6",
+                "sha256:4c68855825ff432d197229846f971bc4d6666ce90492e5b02013bcaca4d9ab05",
+                "sha256:5133f5507007ba08d8b7b263c7aa0f931af5ba88a29beacc4b2dc23fcefe9c06",
+                "sha256:54caaa703227c6e0c87b76326d0862184729a69b73d3b7305b6288e1d830067e",
+                "sha256:58e5f4d08a205b11800332920e285bd25e1a75c54953e05502052738fe16b3b5",
+                "sha256:698c1e0d5c43354ec5d6f4d914d0d553a9ada56c85415700b81dc90125aac244",
+                "sha256:6c1cac07e64433f646a9a838cdc00c9768b3c362805afc3fce341af0e6a9ae9f",
+                "sha256:760415ccc20f9e8747084169110ef75d545f3b0932ee21368f63ac0fee86b221",
+                "sha256:7f622b6822f02bfaf2a5cd31fdb7cd86fcf33dab6ced5185c35f5db98260b055",
+                "sha256:cf57719e581cfd48c4efe28543fea3d139c6b6f1238b3f0102a9c73992cbb479",
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+                "sha256:dbea0bb8575c6b6303cc65017b46351dc5953eea5c0a59d7b7e3a2d2f433a911",
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             ],
             "index": "pypi",
-            "version": "==23.7.0"
+            "markers": "python_version >= '3.8'",
+            "version": "==23.11.0"
         },
         "certifi": {
             "hashes": [
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             "markers": "python_version >= '3.6'",
-            "version": "==2023.7.22"
+            "version": "==2023.11.17"
         },
         "charset-normalizer": {
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@@ -391,6 +402,7 @@
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@@ -447,6 +459,7 @@
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@@ -455,6 +468,7 @@
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@@ -471,36 +485,46 @@
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@@ -520,11 +544,12 @@
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@@ -532,15 +557,16 @@
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@@ -576,36 +602,37 @@
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@@ -617,11 +644,11 @@
         },
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@@ -641,11 +668,11 @@
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@@ -655,36 +682,29 @@
             "markers": "sys_platform != 'win32'",
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@@ -702,11 +722,11 @@
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@@ -718,23 +738,26 @@
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@@ -742,7 +765,10 @@
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@@ -750,9 +776,12 @@
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@@ -767,7 +796,9 @@
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@@ -788,11 +819,11 @@
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@@ -804,18 +835,18 @@
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@@ -825,36 +856,44 @@
             "markers": "python_version >= '3.8'",
             "version": "==5.1.0"
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+        "tomli": {
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-            "markers": "python_version >= '3.7'",
-            "version": "==4.7.1"
+            "markers": "python_version >= '3.8'",
+            "version": "==4.8.0"
         },
         "urllib3": {
             "hashes": [
-                "sha256:8d36afa7616d8ab714608411b4a3b13e58f463aee519024578e062e141dce20f",
-                "sha256:8f135f6502756bde6b2a9b28989df5fbe87c9970cecaa69041edcce7f0589b14"
+                "sha256:c97dfde1f7bd43a71c8d2a58e369e9b2bf692d1334ea9f9cae55add7d0dd0f84",
+                "sha256:fdb6d215c776278489906c2f8916e6e7d4f5a9b602ccbcfdf7f016fc8da0596e"
             ],
             "markers": "python_version >= '3.6'",
-            "version": "==1.26.16"
+            "version": "==2.0.7"
         },
         "wcwidth": {
             "hashes": [
-                "sha256:795b138f6875577cd91bba52baf9e445cd5118fd32723b460e30a0af30ea230e",
-                "sha256:a5220780a404dbe3353789870978e472cfe477761f06ee55077256e509b156d0"
+                "sha256:25eb3ecbec328cdb945f56f2a7cfe784bdf7a73a8197398c7a7c65e7fe93e9ae",
+                "sha256:c4b153acf29f1f0d7fb1b00d097cce82b73de7a2016321c8d7ca71bd76dd848b"
             ],
-            "version": "==0.2.6"
+            "version": "==0.2.11"
         }
     }
 }
diff --git a/tests/conftest.py b/tests/conftest.py
index 4507579..cd12279 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -5,8 +5,8 @@
 
 import transmogrifier.models as timdex
 from transmogrifier.config import SOURCES, load_external_config
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.datacite import Datacite
+from transmogrifier.sources.transformer import XmlTransformer
 
 
 @pytest.fixture(autouse=True)
@@ -48,15 +48,17 @@ def runner():
 
 @pytest.fixture()
 def datacite_records():
-    return parse_xml_records("tests/fixtures/datacite/datacite_records.xml")
+    return XmlTransformer.parse_source_file(
+        "tests/fixtures/datacite/datacite_records.xml"
+    )
 
 
 @pytest.fixture()
 def datacite_record_all_fields():
-    input_records = parse_xml_records(
+    source_records = XmlTransformer.parse_source_file(
         "tests/fixtures/datacite/datacite_record_all_fields.xml"
     )
-    return Datacite("cool-repo", input_records)
+    return Datacite("cool-repo", source_records)
 
 
 @pytest.fixture()
@@ -71,7 +73,7 @@ def marc_content_type_crosswalk():
 
 @pytest.fixture()
 def oai_pmh_records():
-    return parse_xml_records("tests/fixtures/oai_pmh_records.xml")
+    return XmlTransformer.parse_source_file("tests/fixtures/oai_pmh_records.xml")
 
 
 @pytest.fixture()
diff --git a/tests/test_config.py b/tests/test_config.py
index 695e5fe..15256fe 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -6,10 +6,8 @@
 from transmogrifier.config import (
     configure_logger,
     configure_sentry,
-    get_transformer,
     load_external_config,
 )
-from transmogrifier.sources.datacite import Datacite
 
 
 def test_configure_logger_not_verbose():
@@ -44,25 +42,6 @@ def test_configure_sentry_env_variable_is_dsn(monkeypatch):
     assert result == "Sentry DSN found, exceptions will be sent to Sentry with env=test"
 
 
-def test_get_transformer_returns_correct_class_name():
-    assert get_transformer("jpal") == Datacite
-
-
-def test_get_transformer_source_missing_class_name_raises_error():
-    with pytest.raises(KeyError):
-        get_transformer("cool-repo")
-
-
-def test_get_transformer_source_wrong_class_name_raises_error(bad_config):
-    with pytest.raises(AttributeError):
-        get_transformer("bad-class-name")
-
-
-def test_get_transformer_source_wrong_module_path_raises_error(bad_config):
-    with pytest.raises(ImportError):
-        get_transformer("bad-module-path")
-
-
 def test_load_external_config_invalid_file_type_raises_error():
     with pytest.raises(ValueError):
         load_external_config("config/loc-countries.xml", "zxr")
diff --git a/tests/test_datacite.py b/tests/test_datacite.py
index db20c2b..661ce5e 100644
--- a/tests/test_datacite.py
+++ b/tests/test_datacite.py
@@ -1,4 +1,3 @@
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.models import (
     AlternateTitle,
     Contributor,
@@ -170,10 +169,10 @@ def test_datacite_transform_with_all_fields_transforms_correctly(
 
 
 def test_datacite_transform_missing_required_datacite_fields_logs_warning(caplog):
-    input_records = parse_xml_records(
+    source_records = Datacite.parse_source_file(
         "tests/fixtures/datacite/datacite_record_missing_datacite_required_fields.xml"
     )
-    output_records = Datacite("cool-repo", input_records)
+    output_records = Datacite("cool-repo", source_records)
     next(output_records)
 
     assert (
@@ -195,10 +194,10 @@ def test_datacite_transform_missing_required_datacite_fields_logs_warning(caplog
 
 
 def test_datacite_transform_with_optional_fields_blank_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = Datacite.parse_source_file(
         "tests/fixtures/datacite/datacite_record_optional_fields_blank.xml"
     )
-    output_records = Datacite("cool-repo", input_records)
+    output_records = Datacite("cool-repo", source_records)
     assert next(output_records) == TimdexRecord(
         citation=("Title not provided. https://example.com/doi:10.7910/DVN/19PPE7"),
         source="A Cool Repository",
@@ -218,10 +217,10 @@ def test_datacite_transform_with_optional_fields_blank_transforms_correctly():
 
 
 def test_datacite_transform_with_optional_fields_missing_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = Datacite.parse_source_file(
         "tests/fixtures/datacite/datacite_record_optional_fields_missing.xml"
     )
-    output_records = Datacite("cool-repo", input_records)
+    output_records = Datacite("cool-repo", source_records)
     assert next(output_records) == TimdexRecord(
         citation=("Title not provided. https://example.com/doi:10.7910/DVN/19PPE7"),
         source="A Cool Repository",
@@ -241,10 +240,10 @@ def test_datacite_transform_with_optional_fields_missing_transforms_correctly():
 
 
 def test_datacite_with_attribute_and_subfield_variations_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = Datacite.parse_source_file(
         "tests/fixtures/datacite/datacite_record_attribute_and_subfield_variations.xml"
     )
-    output_records = Datacite("cool-repo", input_records)
+    output_records = Datacite("cool-repo", source_records)
     assert next(output_records) == TimdexRecord(
         citation=(
             "Creator, No affiliation no identifier, Creator, Blank affiliation blank "
diff --git a/tests/test_dspace_dim.py b/tests/test_dspace_dim.py
index fcee6ae..b86c9df 100644
--- a/tests/test_dspace_dim.py
+++ b/tests/test_dspace_dim.py
@@ -1,13 +1,12 @@
 import transmogrifier.models as timdex
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.dspace_dim import DspaceDim
 
 
 def test_dspace_dim_transform_with_all_fields_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = DspaceDim.parse_source_file(
         "tests/fixtures/dspace/dspace_dim_record_all_fields.xml"
     )
-    output_records = DspaceDim("cool-repo", input_records)
+    output_records = DspaceDim("cool-repo", source_records)
     assert next(output_records) == timdex.TimdexRecord(
         citation="Journal of Geophysical Research: Solid Earth 121 (2016): 5859–5879",
         source="A Cool Repository",
@@ -133,10 +132,10 @@ def test_dspace_dim_transform_with_all_fields_transforms_correctly():
 
 
 def test_dspace_dim_transform_with_attribute_variations_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = DspaceDim.parse_source_file(
         "tests/fixtures/dspace/dspace_dim_record_attribute_variations.xml"
     )
-    output_records = DspaceDim("cool-repo", input_records)
+    output_records = DspaceDim("cool-repo", source_records)
     assert next(output_records) == timdex.TimdexRecord(
         citation="Title with Blank Qualifier. https://example.com/1912/2641",
         source="A Cool Repository",
@@ -188,10 +187,10 @@ def test_dspace_dim_transform_with_attribute_variations_transforms_correctly():
 
 
 def test_dspace_dim_transform_with_optional_fields_blank_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = DspaceDim.parse_source_file(
         "tests/fixtures/dspace/dspace_dim_record_optional_fields_blank.xml"
     )
-    output_records = DspaceDim("cool-repo", input_records)
+    output_records = DspaceDim("cool-repo", source_records)
     assert next(output_records) == timdex.TimdexRecord(
         source="A Cool Repository",
         source_link="https://example.com/1912/2641",
@@ -204,10 +203,10 @@ def test_dspace_dim_transform_with_optional_fields_blank_transforms_correctly():
 
 
 def test_dspace_dim_transform_with_optional_fields_missing_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = DspaceDim.parse_source_file(
         "tests/fixtures/dspace/dspace_dim_record_optional_fields_missing.xml"
     )
-    output_records = DspaceDim("cool-repo", input_records)
+    output_records = DspaceDim("cool-repo", source_records)
     assert next(output_records) == timdex.TimdexRecord(
         source="A Cool Repository",
         source_link="https://example.com/1912/2641",
diff --git a/tests/test_dspace_mets.py b/tests/test_dspace_mets.py
index 57c4bf0..fb7b8bc 100644
--- a/tests/test_dspace_mets.py
+++ b/tests/test_dspace_mets.py
@@ -1,10 +1,9 @@
 import transmogrifier.models as timdex
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.dspace_mets import DspaceMets
 
 
 def test_dspace_mets_transform_with_missing_optional_fields_transforms_correctly():
-    dspace_xml_records = parse_xml_records(
+    dspace_xml_records = DspaceMets.parse_source_file(
         "tests/fixtures/dspace/dspace_mets_record_optional_fields_missing.xml"
     )
     output_records = DspaceMets("dspace", dspace_xml_records)
@@ -20,7 +19,7 @@ def test_dspace_mets_transform_with_missing_optional_fields_transforms_correctly
 
 
 def test_dspace_mets_transform_with_blank_optional_fields_transforms_correctly():
-    dspace_xml_records = parse_xml_records(
+    dspace_xml_records = DspaceMets.parse_source_file(
         "tests/fixtures/dspace/dspace_mets_record_optional_fields_blank.xml"
     )
     output_records = DspaceMets("dspace", dspace_xml_records)
@@ -36,7 +35,7 @@ def test_dspace_mets_transform_with_blank_optional_fields_transforms_correctly()
 
 
 def test_dspace_mets_with_attribute_and_subfield_variations_transforms_correctly():
-    dspace_xml_records = parse_xml_records(
+    dspace_xml_records = DspaceMets.parse_source_file(
         "tests/fixtures/dspace/dspace_mets_record_attribute_and_subfield_variations.xml"
     )
     output_records = DspaceMets("dspace", dspace_xml_records)
@@ -85,7 +84,7 @@ def test_dspace_mets_with_attribute_and_subfield_variations_transforms_correctly
 
 
 def test_dspace_mets_transform_with_all_fields_transforms_correctly():
-    dspace_xml_records = parse_xml_records(
+    dspace_xml_records = DspaceMets.parse_source_file(
         "tests/fixtures/dspace/dspace_mets_record_all_fields.xml"
     )
     output_records = DspaceMets("dspace", dspace_xml_records)
diff --git a/tests/test_ead.py b/tests/test_ead.py
index 4855a58..c7de237 100644
--- a/tests/test_ead.py
+++ b/tests/test_ead.py
@@ -1,12 +1,13 @@
 import logging
 
 import transmogrifier.models as timdex
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.ead import Ead
 
 
 def test_ead_record_all_fields_transform_correctly():
-    ead_xml_records = parse_xml_records("tests/fixtures/ead/ead_record_all_fields.xml")
+    ead_xml_records = Ead.parse_source_file(
+        "tests/fixtures/ead/ead_record_all_fields.xml"
+    )
     output_records = Ead("aspace", ead_xml_records)
     assert next(output_records) == timdex.TimdexRecord(
         source="MIT ArchivesSpace",
@@ -216,7 +217,7 @@ def test_ead_record_all_fields_transform_correctly():
 
 
 def test_ead_record_with_missing_archdesc_logs_error(caplog):
-    ead_xml_records = parse_xml_records(
+    ead_xml_records = Ead.parse_source_file(
         "tests/fixtures/ead/ead_record_missing_archdesc.xml"
     )
     output_records = Ead("aspace", ead_xml_records)
@@ -230,7 +231,7 @@ def test_ead_record_with_missing_archdesc_logs_error(caplog):
 
 
 def test_ead_record_with_missing_archdesc_did_logs_error(caplog):
-    ead_xml_records = parse_xml_records(
+    ead_xml_records = Ead.parse_source_file(
         "tests/fixtures/ead/ead_record_missing_archdesc_did.xml"
     )
     output_records = Ead("aspace", ead_xml_records)
@@ -244,7 +245,7 @@ def test_ead_record_with_missing_archdesc_did_logs_error(caplog):
 
 
 def test_ead_record_with_attribute_and_subfield_variations_transforms_correctly():
-    ead_xml_records = parse_xml_records(
+    ead_xml_records = Ead.parse_source_file(
         "tests/fixtures/ead/ead_record_attribute_and_subfield_variations.xml"
     )
     output_records = Ead("aspace", ead_xml_records)
@@ -470,7 +471,7 @@ def test_ead_record_with_attribute_and_subfield_variations_transforms_correctly(
 
 
 def test_ead_record_with_blank_optional_fields_transforms_correctly():
-    ead_xml_records = parse_xml_records(
+    ead_xml_records = Ead.parse_source_file(
         "tests/fixtures/ead/ead_record_blank_optional_fields.xml"
     )
     output_records = Ead("aspace", ead_xml_records)
@@ -488,7 +489,7 @@ def test_ead_record_with_blank_optional_fields_transforms_correctly():
 
 
 def test_ead_record_invalid_date_and_date_range_are_omitted(caplog):
-    ead_xml_records = parse_xml_records(
+    ead_xml_records = Ead.parse_source_file(
         "tests/fixtures/ead/ead_record_attribute_and_subfield_variations.xml"
     )
     output_record = next(Ead("aspace", ead_xml_records))
@@ -507,7 +508,7 @@ def test_ead_record_invalid_date_and_date_range_are_omitted(caplog):
 
 
 def test_ead_record_correct_identifiers_from_multiple_unitid(caplog):
-    ead_xml_records = parse_xml_records(
+    ead_xml_records = Ead.parse_source_file(
         "tests/fixtures/ead/ead_record_attribute_and_subfield_variations.xml"
     )
     output_record = next(Ead("aspace", ead_xml_records))
@@ -516,7 +517,7 @@ def test_ead_record_correct_identifiers_from_multiple_unitid(caplog):
 
 
 def test_ead_record_with_missing_optional_fields_transforms_correctly():
-    ead_xml_records = parse_xml_records(
+    ead_xml_records = Ead.parse_source_file(
         "tests/fixtures/ead/ead_record_missing_optional_fields.xml"
     )
     output_records = Ead("aspace", ead_xml_records)
diff --git a/tests/test_helpers.py b/tests/test_helpers.py
index f64bc45..e1008f0 100644
--- a/tests/test_helpers.py
+++ b/tests/test_helpers.py
@@ -4,7 +4,6 @@
 from transmogrifier.helpers import (
     generate_citation,
     parse_date_from_string,
-    parse_xml_records,
     validate_date,
     validate_date_range,
 )
@@ -189,11 +188,6 @@ def test_generate_citation_with_all_fields():
     )
 
 
-def test_parse_xml_records_returns_record_iterator():
-    records = parse_xml_records("tests/fixtures/datacite/datacite_records.xml")
-    assert len(list(records)) == 38
-
-
 def test_parse_date_from_string_success():
     for date in [
         "1930",
diff --git a/tests/test_marc.py b/tests/test_marc.py
index d5f2b61..2256dbc 100644
--- a/tests/test_marc.py
+++ b/tests/test_marc.py
@@ -3,12 +3,11 @@
 from bs4 import BeautifulSoup
 
 import transmogrifier.models as timdex
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.marc import Marc
 
 
 def test_marc_record_all_fields_transform_correctly():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_all_fields.xml"
     )
     output_records = Marc("alma", marc_xml_records)
@@ -489,7 +488,7 @@ def test_marc_record_all_fields_transform_correctly():
 
 
 def test_marc_record_attribute_and_subfield_variations_transforms_correctly():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_attribute_and_subfield_variations.xml",
     )
     output_records = Marc("alma", marc_xml_records)
@@ -706,7 +705,7 @@ def test_marc_record_attribute_and_subfield_variations_transforms_correctly():
 
 
 def test_marc_record_with_blank_optional_fields_transforms_correctly():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_blank_optional_fields.xml"
     )
     output_records = Marc("alma", marc_xml_records)
@@ -727,7 +726,7 @@ def test_marc_record_with_blank_optional_fields_transforms_correctly():
 
 
 def test_marc_record_with_missing_optional_fields_transforms_correctly():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_missing_optional_fields.xml"
     )
     output_records = Marc("alma", marc_xml_records)
@@ -746,7 +745,7 @@ def test_marc_record_with_missing_optional_fields_transforms_correctly():
 
 
 def test_marc_record_missing_leader_logs_error(caplog):
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_missing_leader.xml"
     )
     output_records = Marc("alma", marc_xml_records)
@@ -760,7 +759,7 @@ def test_marc_record_missing_leader_logs_error(caplog):
 
 
 def test_marc_record_missing_008_logs_error(caplog):
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_missing_008.xml"
     )
     output_records = Marc("alma", marc_xml_records)
@@ -774,7 +773,7 @@ def test_marc_record_missing_008_logs_error(caplog):
 
 
 def test_create_subfield_value_list_from_datafield_with_values():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_all_fields.xml"
     )
     datafield = next(marc_xml_records).find_all("datafield", tag="130")[0]
@@ -786,7 +785,7 @@ def test_create_subfield_value_list_from_datafield_with_values():
 
 
 def test_create_subfield_value_list_from_datafield_with_blank_values():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_blank_optional_fields.xml"
     )
     datafield = next(marc_xml_records).find_all("datafield", tag="130")[0]
@@ -794,7 +793,7 @@ def test_create_subfield_value_list_from_datafield_with_blank_values():
 
 
 def test_create_subfield_value_string_from_datafield_with_values():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_all_fields.xml"
     )
     datafield = next(marc_xml_records).find_all("datafield", tag="130")[0]
@@ -805,7 +804,7 @@ def test_create_subfield_value_string_from_datafield_with_values():
 
 
 def test_create_subfield_value_string_from_datafield_with_blank_values():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_blank_optional_fields.xml"
     )
     datafield = next(marc_xml_records).find_all("datafield", tag="130")[0]
@@ -894,7 +893,7 @@ def test_loc_crosswalk_code_to_name_returns_name(caplog, loc_country_crosswalk):
 
 
 def test_get_main_titles_record_with_title():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_all_fields.xml"
     )
     assert Marc.get_main_titles(next(marc_xml_records)) == [
@@ -903,31 +902,35 @@ def test_get_main_titles_record_with_title():
 
 
 def test_get_main_titles_record_with_blank_title():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_blank_optional_fields.xml"
     )
     assert Marc.get_main_titles(next(marc_xml_records)) == []
 
 
 def test_get_main_titles_record_without_title():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_missing_optional_fields.xml"
     )
     assert Marc.get_main_titles(next(marc_xml_records)) == []
 
 
 def test_get_source_record_id():
-    marc_xml_records = parse_xml_records(
+    marc_xml_records = Marc.parse_source_file(
         "tests/fixtures/marc/marc_record_all_fields.xml"
     )
     assert Marc.get_source_record_id(next(marc_xml_records)) == "990027185640106761"
 
 
 def test_record_is_deleted_returns_true_if_deleted():
-    deleted_record = parse_xml_records("tests/fixtures/marc/marc_record_deleted.xml")
+    deleted_record = Marc.parse_source_file(
+        "tests/fixtures/marc/marc_record_deleted.xml"
+    )
     assert Marc.record_is_deleted(next(deleted_record)) is True
 
 
 def test_record_is_deleted_returns_false_if_not_deleted():
-    marc_record = parse_xml_records("tests/fixtures/marc/marc_record_all_fields.xml")
+    marc_record = Marc.parse_source_file(
+        "tests/fixtures/marc/marc_record_all_fields.xml"
+    )
     assert Marc.record_is_deleted(next(marc_record)) is False
diff --git a/tests/test_oai_dc.py b/tests/test_oai_dc.py
index a1b98a8..d3103f0 100644
--- a/tests/test_oai_dc.py
+++ b/tests/test_oai_dc.py
@@ -1,5 +1,4 @@
 import transmogrifier.models as timdex
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.oaidc import OaiDc
 
 FIXTURES_PREFIX = "tests/fixtures/oai_dc"
@@ -20,8 +19,10 @@
 
 
 def test_oaidctransform_with_all_fields_transforms_correctly():
-    input_records = parse_xml_records(f"{FIXTURES_PREFIX}/oaidc_record_all_fields.xml")
-    output_records = OaiDc("libguides", input_records)
+    source_records = OaiDc.parse_source_file(
+        f"{FIXTURES_PREFIX}/oaidc_record_all_fields.xml"
+    )
+    output_records = OaiDc("libguides", source_records)
     assert next(output_records) == timdex.TimdexRecord(
         source="LibGuides",
         source_link="https://libguides.mit.edu/guides/175846",
@@ -52,27 +53,27 @@ def test_oaidctransform_with_all_fields_transforms_correctly():
 
 
 def test_oaidc_transform_with_optional_fields_blank_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = OaiDc.parse_source_file(
         f"{FIXTURES_PREFIX}/oaidc_record_optional_fields_blank.xml"
     )
-    output_records = OaiDc("libguides", input_records)
+    output_records = OaiDc("libguides", source_records)
     assert next(output_records) == BLANK_OR_MISSING_OPTIONAL_FIELDS_TIMDEX
 
 
 def test_oaidc_transform_with_optional_fields_missing_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = OaiDc.parse_source_file(
         f"{FIXTURES_PREFIX}/oaidc_record_optional_fields_missing.xml"
     )
-    output_records = OaiDc("libguides", input_records)
+    output_records = OaiDc("libguides", source_records)
     assert next(output_records) == BLANK_OR_MISSING_OPTIONAL_FIELDS_TIMDEX
 
 
 def test_oaidc_generic_date():
-    input_records = parse_xml_records(
+    source_records = OaiDc.parse_source_file(
         f"{FIXTURES_PREFIX}/oaidc_record_valid_generic_date.xml"
     )
-    transformer_instance = OaiDc("libguides", input_records)
-    xml = next(transformer_instance.input_records)
+    transformer_instance = OaiDc("libguides", source_records)
+    xml = next(transformer_instance.source_records)
     assert transformer_instance.get_dates("test_source_record_id", xml) == [
         timdex.Date(kind="Unknown", note=None, range=None, value="2008-06-19T17:55:27")
     ]
diff --git a/tests/test_springshare.py b/tests/test_springshare.py
index ba1c63c..67a81e4 100644
--- a/tests/test_springshare.py
+++ b/tests/test_springshare.py
@@ -1,5 +1,4 @@
 import transmogrifier.models as timdex
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.springshare import SpringshareOaiDc
 
 SPRINGSHARE_FIXTURES_PREFIX = "tests/fixtures/oai_dc/springshare"
@@ -53,11 +52,11 @@
 
 
 def test_springshare_get_dates_valid():
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         f"{SPRINGSHARE_FIXTURES_PREFIX}/springshare_valid_dates.xml"
     )
-    transformer_instance = SpringshareOaiDc("libguides", input_records)
-    for xml in transformer_instance.input_records:
+    transformer_instance = SpringshareOaiDc("libguides", source_records)
+    for xml in transformer_instance.source_records:
         date_field_value = transformer_instance.get_dates("test_get_dates", xml)
         assert date_field_value == [
             timdex.Date(
@@ -67,32 +66,32 @@ def test_springshare_get_dates_valid():
 
 
 def test_springshare_get_dates_invalid_logged_and_skipped(caplog):
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         f"{SPRINGSHARE_FIXTURES_PREFIX}/springshare_invalid_dates.xml"
     )
-    transformer_instance = SpringshareOaiDc("libguides", input_records)
-    for xml in transformer_instance.input_records:
+    transformer_instance = SpringshareOaiDc("libguides", source_records)
+    for xml in transformer_instance.source_records:
         date_field_value = transformer_instance.get_dates("test_get_dates", xml)
         assert date_field_value is None
         assert "has a date that cannot be parsed" in caplog.text
 
 
 def test_springshare_get_links_missing_identifier_logged_and_skipped(caplog):
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         f"{SPRINGSHARE_FIXTURES_PREFIX}/springshare_record_missing_required_fields.xml"
     )
-    transformer_instance = SpringshareOaiDc("libguides", input_records)
-    for xml in transformer_instance.input_records:
+    transformer_instance = SpringshareOaiDc("libguides", source_records)
+    for xml in transformer_instance.source_records:
         links_field_value = transformer_instance.get_links("test_get_links", xml)
         assert links_field_value is None
         assert "has links that cannot be generated" in caplog.text
 
 
 def test_libguide_transform_with_all_fields_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         f"{LIBGUIDES_FIXTURES_PREFIX}/libguides_record_all_fields.xml"
     )
-    output_records = SpringshareOaiDc("libguides", input_records)
+    output_records = SpringshareOaiDc("libguides", source_records)
     assert next(output_records) == timdex.TimdexRecord(
         source="LibGuides",
         source_link="https://libguides.mit.edu/materials",
@@ -133,26 +132,26 @@ def test_libguide_transform_with_all_fields_transforms_correctly():
 
 
 def test_libguides_transform_with_optional_fields_blank_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         f"{LIBGUIDES_FIXTURES_PREFIX}/libguides_record_optional_fields_blank.xml"
     )
-    output_records = SpringshareOaiDc("libguides", input_records)
+    output_records = SpringshareOaiDc("libguides", source_records)
     assert next(output_records) == LIBGUIDES_BLANK_OR_MISSING_OPTIONAL_FIELDS_TIMDEX
 
 
 def test_libguides_transform_with_optional_fields_missing_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         f"{LIBGUIDES_FIXTURES_PREFIX}/libguides_record_optional_fields_missing.xml"
     )
-    output_records = SpringshareOaiDc("libguides", input_records)
+    output_records = SpringshareOaiDc("libguides", source_records)
     assert next(output_records) == LIBGUIDES_BLANK_OR_MISSING_OPTIONAL_FIELDS_TIMDEX
 
 
 def test_research_databases_transform_with_all_fields_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         f"{RESEARCHDATABASES_FIXTURES_PREFIX}/research_databases_record_all_fields.xml"
     )
-    output_records = SpringshareOaiDc("researchdatabases", input_records)
+    output_records = SpringshareOaiDc("researchdatabases", source_records)
     assert next(output_records) == timdex.TimdexRecord(
         source="Research Databases",
         source_link="https://libguides.mit.edu/llba",
@@ -189,11 +188,11 @@ def test_research_databases_transform_with_all_fields_transforms_correctly():
 
 
 def test_research_databases_transform_with_optional_fields_blank_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         RESEARCHDATABASES_FIXTURES_PREFIX
         + "/research_databases_record_optional_fields_blank.xml"
     )
-    output_records = SpringshareOaiDc("researchdatabases", input_records)
+    output_records = SpringshareOaiDc("researchdatabases", source_records)
     assert (
         next(output_records)
         == RESEARCHDATABASES_BLANK_OR_MISSING_OPTIONAL_FIELDS_TIMDEX
@@ -201,11 +200,11 @@ def test_research_databases_transform_with_optional_fields_blank_transforms_corr
 
 
 def test_research_databases_transform_with_optional_fields_missing_transforms_correctly():
-    input_records = parse_xml_records(
+    source_records = SpringshareOaiDc.parse_source_file(
         RESEARCHDATABASES_FIXTURES_PREFIX
         + "/research_databases_record_optional_fields_missing.xml"
     )
-    output_records = SpringshareOaiDc("researchdatabases", input_records)
+    output_records = SpringshareOaiDc("researchdatabases", source_records)
     assert (
         next(output_records)
         == RESEARCHDATABASES_BLANK_OR_MISSING_OPTIONAL_FIELDS_TIMDEX
diff --git a/tests/test_transformer.py b/tests/test_transformer.py
index 57a4985..87e7444 100644
--- a/tests/test_transformer.py
+++ b/tests/test_transformer.py
@@ -1,9 +1,10 @@
 from unittest.mock import patch
 
-from transmogrifier.helpers import parse_xml_records
+import pytest
+
 from transmogrifier.models import TimdexRecord
 from transmogrifier.sources.datacite import Datacite
-from transmogrifier.sources.transformer import Transformer
+from transmogrifier.sources.transformer import Transformer, XmlTransformer
 
 
 def test_transformer_initializes_with_expected_attributes(oai_pmh_records):
@@ -11,25 +12,52 @@ def test_transformer_initializes_with_expected_attributes(oai_pmh_records):
     assert transformer.source == "cool-repo"
     assert transformer.source_base_url == "https://example.com/"
     assert transformer.source_name == "A Cool Repository"
-    assert transformer.input_records == oai_pmh_records
+    assert transformer.source_records == oai_pmh_records
+
+
+def test_transformer_get_transformer_returns_correct_class_name():
+    assert Transformer.get_transformer("jpal") == Datacite
+
+
+def test_transformer_get_transformer_source_missing_class_name_raises_error():
+    with pytest.raises(KeyError):
+        Transformer.get_transformer("cool-repo")
+
 
+def test_transformer_get_transformer_source_wrong_class_name_raises_error(bad_config):
+    with pytest.raises(AttributeError):
+        Transformer.get_transformer("bad-class-name")
 
-def test_transformer_iterates_through_all_records(oai_pmh_records):
-    output_records = Transformer("cool-repo", oai_pmh_records)
+
+def test_transformer_get_transformer_source_wrong_module_path_raises_error(bad_config):
+    with pytest.raises(ImportError):
+        Transformer.get_transformer("bad-module-path")
+
+
+def test_xmltransformer_initializes_with_expected_attributes(oai_pmh_records):
+    transformer = XmlTransformer("cool-repo", oai_pmh_records)
+    assert transformer.source == "cool-repo"
+    assert transformer.source_base_url == "https://example.com/"
+    assert transformer.source_name == "A Cool Repository"
+    assert transformer.source_records == oai_pmh_records
+
+
+def test_xmltransformer_iterates_through_all_records(oai_pmh_records):
+    output_records = XmlTransformer("cool-repo", oai_pmh_records)
     assert len(list(output_records)) == 2
     assert output_records.processed_record_count == 3
     assert output_records.transformed_record_count == 2
     assert len(output_records.deleted_records) == 1
 
 
-def test_transformer_iterates_successfully_if_get_optional_fields_returns_none(
+def test_xmltransformer_iterates_successfully_if_get_optional_fields_returns_none(
     oai_pmh_records,
 ):
     with patch(
-        "transmogrifier.sources.transformer.Transformer.get_optional_fields"
+        "transmogrifier.sources.transformer.XmlTransformer.get_optional_fields"
     ) as m:
         m.return_value = None
-        output_records = Transformer("cool-repo", oai_pmh_records)
+        output_records = XmlTransformer("cool-repo", oai_pmh_records)
         assert len(list(output_records)) == 0
         assert output_records.processed_record_count == 3
         assert output_records.skipped_record_count == 2
@@ -37,13 +65,22 @@ def test_transformer_iterates_successfully_if_get_optional_fields_returns_none(
         assert len(output_records.deleted_records) == 1
 
 
-def test_transformer_record_is_deleted_returns_true_if_deleted(caplog):
-    input_records = parse_xml_records("tests/fixtures/record_deleted.xml")
-    assert Transformer.record_is_deleted(next(input_records)) is True
+def test_xmltransformer_parse_source_file_returns_record_iterator():
+    records = XmlTransformer.parse_source_file(
+        "tests/fixtures/datacite/datacite_records.xml"
+    )
+    assert len(list(records)) == 38
+
 
+def test_xmltransformer_record_is_deleted_returns_true_if_deleted(caplog):
+    source_records = XmlTransformer.parse_source_file(
+        "tests/fixtures/record_deleted.xml"
+    )
+    assert XmlTransformer.record_is_deleted(next(source_records)) is True
 
-def test_transformer_get_required_fields_returns_expected_values(oai_pmh_records):
-    transformer = Transformer("cool-repo", oai_pmh_records)
+
+def test_xmltransformer_get_required_fields_returns_expected_values(oai_pmh_records):
+    transformer = XmlTransformer("cool-repo", oai_pmh_records)
     assert transformer.get_required_fields(next(oai_pmh_records)) == {
         "source": "A Cool Repository",
         "source_link": "https://example.com/12345",
@@ -52,8 +89,8 @@ def test_transformer_get_required_fields_returns_expected_values(oai_pmh_records
     }
 
 
-def test_transformer_transform_returns_timdex_record(oai_pmh_records):
-    transformer = Transformer("cool-repo", oai_pmh_records)
+def test_xmltransformer_transform_returns_timdex_record(oai_pmh_records):
+    transformer = XmlTransformer("cool-repo", oai_pmh_records)
     assert next(transformer) == TimdexRecord(
         source="A Cool Repository",
         source_link="https://example.com/12345",
@@ -64,9 +101,11 @@ def test_transformer_transform_returns_timdex_record(oai_pmh_records):
     )
 
 
-def test_get_valid_title_with_title_field_blank_logs_warning(caplog):
-    input_records = parse_xml_records("tests/fixtures/record_title_field_blank.xml")
-    output_records = Datacite("cool-repo", input_records)
+def test_xmltransformer_get_valid_title_with_title_field_blank_logs_warning(caplog):
+    source_records = XmlTransformer.parse_source_file(
+        "tests/fixtures/record_title_field_blank.xml"
+    )
+    output_records = Datacite("cool-repo", source_records)
     assert next(output_records).title == "Title not provided"
     assert (
         "Record doi:10.7910/DVN/19PPE7 was missing a title, source record should be "
@@ -74,9 +113,11 @@ def test_get_valid_title_with_title_field_blank_logs_warning(caplog):
     )
 
 
-def test_get_valid_title_with_title_field_missing_logs_warning(caplog):
-    input_records = parse_xml_records("tests/fixtures/record_title_field_missing.xml")
-    output_records = Datacite("cool-repo", input_records)
+def test_xmltransformer_get_valid_title_with_title_field_missing_logs_warning(caplog):
+    source_records = XmlTransformer.parse_source_file(
+        "tests/fixtures/record_title_field_missing.xml"
+    )
+    output_records = Datacite("cool-repo", source_records)
     assert next(output_records).title == "Title not provided"
     assert (
         "Record doi:10.7910/DVN/19PPE7 was missing a title, source record should be "
@@ -84,9 +125,11 @@ def test_get_valid_title_with_title_field_missing_logs_warning(caplog):
     )
 
 
-def test_get_valid_title_with_title_field_multiple_logs_warning(caplog):
-    input_records = parse_xml_records("tests/fixtures/record_title_field_multiple.xml")
-    output_records = Datacite("cool-repo", input_records)
+def test_xmltransformer_get_valid_title_with_title_field_multiple_logs_warning(caplog):
+    source_records = XmlTransformer.parse_source_file(
+        "tests/fixtures/record_title_field_multiple.xml"
+    )
+    output_records = Datacite("cool-repo", source_records)
     assert (
         next(output_records).title
         == "The Impact of Maternal Literacy and Participation Programs"
diff --git a/tests/test_whoas.py b/tests/test_whoas.py
index 2e036d1..29d0664 100644
--- a/tests/test_whoas.py
+++ b/tests/test_whoas.py
@@ -1,4 +1,3 @@
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.whoas import Whoas
 
 
@@ -32,11 +31,11 @@ def test_valid_content_types_with_all_valid():
 
 
 def test_whoas_skips_records_with_only_invalid_or_not_present_content_types():
-    input_records = list(
-        parse_xml_records(
+    source_records = list(
+        Whoas.parse_source_file(
             "tests/fixtures/dspace/whoas_records_with_valid_and_invalid_content_types.xml"
         )
     )
-    assert len(input_records) == 4
-    output_records = Whoas("whoas", iter(input_records))
+    assert len(source_records) == 4
+    output_records = Whoas("whoas", iter(source_records))
     assert len(list(output_records)) == 2
diff --git a/tests/test_zenodo.py b/tests/test_zenodo.py
index 03dd3d1..5589e51 100644
--- a/tests/test_zenodo.py
+++ b/tests/test_zenodo.py
@@ -1,10 +1,11 @@
-from transmogrifier.helpers import parse_xml_records
 from transmogrifier.sources.zenodo import Zenodo
 
 
 def test_zenodo_create_source_record_id_generates_correct_id():
-    input_records = parse_xml_records("tests/fixtures/datacite/zenodo_record.xml")
-    output_records = Zenodo("zenodo", input_records)
+    source_records = Zenodo.parse_source_file(
+        "tests/fixtures/datacite/zenodo_record.xml"
+    )
+    output_records = Zenodo("zenodo", source_records)
     zenodo_record = next(output_records)
     assert zenodo_record.source_link == "https://zenodo.org/record/4291646"
     assert zenodo_record.timdex_record_id == "zenodo:4291646"
@@ -39,12 +40,12 @@ def test_valid_content_types_with_all_valid():
 
 
 def test_zenodo_skips_records_with_invalid_content_types():
-    input_records = list(
-        parse_xml_records(
+    source_records = list(
+        Zenodo.parse_source_file(
             "tests/fixtures/datacite/"
             "zenodo_records_with_valid_and_invalid_content_types.xml"
         )
     )
-    assert len(input_records) == 2
-    output_records = Zenodo("zenodo", iter(input_records))
+    assert len(source_records) == 2
+    output_records = Zenodo("zenodo", iter(source_records))
     assert len(list(output_records)) == 1
diff --git a/transmogrifier/cli.py b/transmogrifier/cli.py
index f9ea804..ec168f9 100644
--- a/transmogrifier/cli.py
+++ b/transmogrifier/cli.py
@@ -4,17 +4,9 @@
 
 import click
 
-from transmogrifier.config import (
-    SOURCES,
-    configure_logger,
-    configure_sentry,
-    get_transformer,
-)
-from transmogrifier.helpers import (
-    parse_xml_records,
-    write_deleted_records_to_file,
-    write_timdex_records_to_json,
-)
+from transmogrifier.config import SOURCES, configure_logger, configure_sentry
+from transmogrifier.helpers import write_deleted_records_to_file
+from transmogrifier.sources.transformer import Transformer
 
 logger = logging.getLogger(__name__)
 
@@ -49,13 +41,11 @@ def main(source, input_file, output_file, verbose):
     logger.info(configure_sentry())
     logger.info("Running transform for source %s", source)
 
-    input_records = parse_xml_records(input_file)
-    transformer_class = get_transformer(source)
-    transformer_instance = transformer_class(source, input_records)
-    write_timdex_records_to_json(transformer_instance, output_file)
-    if transformer_instance.processed_record_count == 0:
+    transformer = Transformer.load(source, input_file)
+    transformer.write_timdex_records_to_json(output_file)
+    if transformer.processed_record_count == 0:
         raise ValueError("No records processed from input file, needs investigation")
-    if deleted_records := transformer_instance.deleted_records:
+    if deleted_records := transformer.deleted_records:
         deleted_output_file = output_file.replace("index", "delete").replace(
             "json", "txt"
         )
@@ -67,10 +57,10 @@ def main(source, input_file, output_file, verbose):
             "skipped records: %d, "
             "deleted records: %d"
         ),
-        transformer_instance.processed_record_count,
-        transformer_instance.transformed_record_count,
-        transformer_instance.skipped_record_count,
-        len(transformer_instance.deleted_records),
+        transformer.processed_record_count,
+        transformer.transformed_record_count,
+        transformer.skipped_record_count,
+        len(transformer.deleted_records),
     )
     elapsed_time = perf_counter() - START_TIME
     logger.info(
diff --git a/transmogrifier/config.py b/transmogrifier/config.py
index 94fc58c..ea96c16 100644
--- a/transmogrifier/config.py
+++ b/transmogrifier/config.py
@@ -2,7 +2,6 @@
 import json
 import logging
 import os
-from importlib import import_module
 from typing import Literal, Union
 
 import sentry_sdk
@@ -151,17 +150,6 @@ def configure_sentry() -> str:
     return "No Sentry DSN found, exceptions will not be sent to Sentry"
 
 
-def get_transformer(source: str) -> type:
-    """
-    Return configured transformer class for a source.
-
-    Source must be configured with a valid transform class path.
-    """
-    module_name, class_name = SOURCES[source]["transform-class"].rsplit(".", 1)
-    source_module = import_module(module_name)
-    return getattr(source_module, class_name)
-
-
 def load_external_config(
     file_path: str, file_type: Literal["json", "xml"]
 ) -> Union[dict, BeautifulSoup]:
diff --git a/transmogrifier/helpers.py b/transmogrifier/helpers.py
index 7a4fdc3..c749730 100644
--- a/transmogrifier/helpers.py
+++ b/transmogrifier/helpers.py
@@ -1,24 +1,10 @@
-import json
 import logging
-import os
 from datetime import datetime
-from typing import TYPE_CHECKING, Iterator, Optional
+from typing import Optional
 
-from attrs import asdict
-from bs4 import BeautifulSoup, Tag
-
-# Note: the lxml module in defusedxml is deprecated, so we have to use the
-# regular lxml library. Transmogrifier only parses data from known sources so this
-# should not be a security issue.
-from lxml import etree  # nosec B410
 from smart_open import open
 
 from transmogrifier.config import DATE_FORMATS
-from transmogrifier.models import TimdexRecord
-
-# import Transformer only when type checking to avoid circular dependency
-if TYPE_CHECKING:  # pragma: no cover
-    from transmogrifier.sources.transformer import Transformer
 
 logger = logging.getLogger(__name__)
 
@@ -73,22 +59,6 @@ def generate_citation(extracted_data: dict) -> str:
     return citation
 
 
-def parse_xml_records(
-    input_file_path: str,
-) -> Iterator[Tag]:
-    with open(input_file_path, "rb") as file:
-        for _, element in etree.iterparse(
-            file,
-            tag="{*}record",
-            encoding="utf-8",
-            recover=True,
-        ):
-            record_string = etree.tostring(element, encoding="utf-8")
-            record = BeautifulSoup(record_string, "xml")
-            yield record
-            element.clear()
-
-
 def parse_date_from_string(
     date_string: str,
 ) -> Optional[datetime]:
@@ -176,37 +146,6 @@ def write_deleted_records_to_file(deleted_records: list[str], output_file_path:
             file.write(f"{record_id}\n")
 
 
-def write_timdex_records_to_json(
-    transformer_instance: "Transformer", output_file_path: str
-) -> int:
-    count = 0
-    try:
-        record: TimdexRecord = next(transformer_instance)
-    except StopIteration:
-        return count
-    with open(output_file_path, "w") as file:
-        file.write("[\n")
-        while record:
-            file.write(
-                json.dumps(
-                    asdict(record, filter=lambda attr, value: value is not None),
-                    indent=2,
-                )
-            )
-            count += 1
-            if count % int(os.getenv("STATUS_UPDATE_INTERVAL", 1000)) == 0:
-                logger.info(
-                    "Status update: %s records written to output file so far!", count
-                )
-            try:
-                record: TimdexRecord = next(transformer_instance)  # type: ignore[no-redef]  # noqa: E501
-            except StopIteration:
-                break
-            file.write(",\n")
-        file.write("\n]")
-    return count
-
-
 class DeletedRecord(Exception):
     """Exception raised for records with a deleted status.
 
diff --git a/transmogrifier/sources/datacite.py b/transmogrifier/sources/datacite.py
index d7e2f94..1aee2aa 100644
--- a/transmogrifier/sources/datacite.py
+++ b/transmogrifier/sources/datacite.py
@@ -5,12 +5,12 @@
 
 import transmogrifier.models as timdex
 from transmogrifier.helpers import validate_date, validate_date_range
-from transmogrifier.sources.transformer import Transformer
+from transmogrifier.sources.transformer import XmlTransformer
 
 logger = logging.getLogger(__name__)
 
 
-class Datacite(Transformer):
+class Datacite(XmlTransformer):
     """Datacite transformer."""
 
     def get_optional_fields(self, xml: Tag) -> Optional[dict]:
diff --git a/transmogrifier/sources/dspace_dim.py b/transmogrifier/sources/dspace_dim.py
index 3c3582c..cee4229 100644
--- a/transmogrifier/sources/dspace_dim.py
+++ b/transmogrifier/sources/dspace_dim.py
@@ -5,12 +5,12 @@
 
 import transmogrifier.models as timdex
 from transmogrifier.helpers import validate_date, validate_date_range
-from transmogrifier.sources.transformer import Transformer
+from transmogrifier.sources.transformer import XmlTransformer
 
 logger = logging.getLogger(__name__)
 
 
-class DspaceDim(Transformer):
+class DspaceDim(XmlTransformer):
     """DSpace DIM transformer."""
 
     def get_optional_fields(self, xml: Tag) -> Optional[dict]:
diff --git a/transmogrifier/sources/dspace_mets.py b/transmogrifier/sources/dspace_mets.py
index ce4cb64..77c9cb8 100644
--- a/transmogrifier/sources/dspace_mets.py
+++ b/transmogrifier/sources/dspace_mets.py
@@ -5,12 +5,12 @@
 
 import transmogrifier.models as timdex
 from transmogrifier.helpers import validate_date
-from transmogrifier.sources.transformer import Transformer
+from transmogrifier.sources.transformer import XmlTransformer
 
 logger = logging.getLogger(__name__)
 
 
-class DspaceMets(Transformer):
+class DspaceMets(XmlTransformer):
     """DSpace METS transformer."""
 
     def get_optional_fields(self, xml: Tag) -> dict:
diff --git a/transmogrifier/sources/ead.py b/transmogrifier/sources/ead.py
index d82b1dc..82cdbad 100644
--- a/transmogrifier/sources/ead.py
+++ b/transmogrifier/sources/ead.py
@@ -6,7 +6,7 @@
 import transmogrifier.models as timdex
 from transmogrifier.config import load_external_config
 from transmogrifier.helpers import validate_date, validate_date_range
-from transmogrifier.sources.transformer import Transformer
+from transmogrifier.sources.transformer import XmlTransformer
 
 logger = logging.getLogger(__name__)
 
@@ -16,7 +16,7 @@
 )
 
 
-class Ead(Transformer):
+class Ead(XmlTransformer):
     """EAD transformer."""
 
     def get_optional_fields(self, xml: Tag) -> Optional[dict]:
diff --git a/transmogrifier/sources/marc.py b/transmogrifier/sources/marc.py
index 95240bf..0077cc4 100644
--- a/transmogrifier/sources/marc.py
+++ b/transmogrifier/sources/marc.py
@@ -6,7 +6,7 @@
 import transmogrifier.models as timdex
 from transmogrifier.config import load_external_config
 from transmogrifier.helpers import validate_date
-from transmogrifier.sources.transformer import Transformer
+from transmogrifier.sources.transformer import XmlTransformer
 
 logger = logging.getLogger(__name__)
 
@@ -30,7 +30,7 @@
 )
 
 
-class Marc(Transformer):
+class Marc(XmlTransformer):
     """Marc transformer."""
 
     def get_optional_fields(self, xml: Tag) -> Optional[dict]:
diff --git a/transmogrifier/sources/oaidc.py b/transmogrifier/sources/oaidc.py
index 6453e58..5645e17 100644
--- a/transmogrifier/sources/oaidc.py
+++ b/transmogrifier/sources/oaidc.py
@@ -5,12 +5,12 @@
 
 import transmogrifier.models as timdex
 from transmogrifier.helpers import validate_date
-from transmogrifier.sources.transformer import Transformer
+from transmogrifier.sources.transformer import XmlTransformer
 
 logger = logging.getLogger(__name__)
 
 
-class OaiDc(Transformer):
+class OaiDc(XmlTransformer):
     """
     Generic OAI DC transformer.
 
diff --git a/transmogrifier/sources/transformer.py b/transmogrifier/sources/transformer.py
index 4072a16..1fc0c5d 100644
--- a/transmogrifier/sources/transformer.py
+++ b/transmogrifier/sources/transformer.py
@@ -1,9 +1,20 @@
 """Transformer module."""
+from __future__ import annotations
+
+import json
 import logging
+import os
 from abc import ABCMeta, abstractmethod
-from typing import Iterator, Optional, final
+from importlib import import_module
+from typing import Iterator, Optional, TypeAlias, final
+
+from attrs import asdict
+from bs4 import BeautifulSoup, Tag
 
-from bs4 import Tag
+# Note: the lxml module in defusedxml is deprecated, so we have to use the
+# regular lxml library. Transmogrifier only parses data from known sources so this
+# should not be a security issue.
+from lxml import etree  # nosec B410
 
 from transmogrifier.config import SOURCES
 from transmogrifier.helpers import DeletedRecord, generate_citation
@@ -11,40 +22,45 @@
 
 logger = logging.getLogger(__name__)
 
+JSON: TypeAlias = dict[str, "JSON"] | list["JSON"] | str | int | float | bool | None
+
 
 class Transformer(object):
     """Base transformer class."""
 
     __metaclass__ = ABCMeta
 
-    def __init__(self, source: str, input_records: Iterator[Tag]) -> None:
+    @final
+    def __init__(self, source: str, source_records: Iterator[JSON | Tag]) -> None:
         """
         Initialize Transformer instance.
 
         Args:
-            source: Source repository short label. Must match a source key from
-                config.SOURCES
+            source: Source repository label. Must match a source key from config.SOURCES.
+            source_records: A set of source records to be processed.
         """
-        self.source = source
-        self.source_base_url = SOURCES[source]["base-url"]
+        self.source: str = source
+        self.source_base_url: str = SOURCES[source]["base-url"]
         self.source_name = SOURCES[source]["name"]
-        self.input_records = input_records
-        self.processed_record_count = 0
-        self.transformed_record_count = 0
-        self.skipped_record_count = 0
+        self.source_records: Iterator[JSON | Tag] = source_records
+        self.processed_record_count: int = 0
+        self.transformed_record_count: int = 0
+        self.skipped_record_count: int = 0
         self.deleted_records: list[str] = []
 
+    @final
     def __iter__(self) -> Iterator[TimdexRecord]:
         """Iterate over transformed records."""
         return self
 
+    @final
     def __next__(self) -> TimdexRecord:
         """Return next transformed record."""
         while True:
-            xml = next(self.input_records)
+            source_record = next(self.source_records)
             self.processed_record_count += 1
             try:
-                record = self.transform(xml)
+                record = self.transform(source_record)
             except DeletedRecord as error:
                 self.deleted_records.append(error.timdex_record_id)
                 continue
@@ -55,73 +71,308 @@ def __next__(self) -> TimdexRecord:
                 self.skipped_record_count += 1
                 continue
 
+    @final
+    def write_timdex_records_to_json(self, output_file: str) -> int:
+        """
+        Write TIMDEX records to JSON file.
+
+        Args:
+            output_file: The JSON file used for writing TIMDEX records.
+
+        """
+        count = 0
+        try:
+            record: TimdexRecord = next(self)
+        except StopIteration:
+            return count
+        with open(output_file, "w") as file:
+            file.write("[\n")
+            while record:
+                file.write(
+                    json.dumps(
+                        asdict(record, filter=lambda attr, value: value is not None),
+                        indent=2,
+                    )
+                )
+                count += 1
+                if count % int(os.getenv("STATUS_UPDATE_INTERVAL", 1000)) == 0:
+                    logger.info(
+                        "Status update: %s records written to output file so far!",
+                        count,
+                    )
+                try:
+                    record: TimdexRecord = next(self)  # type: ignore[no-redef]  # noqa: E501
+                except StopIteration:
+                    break
+                file.write(",\n")
+            file.write("\n]")
+        return count
+
+    @final
+    @classmethod
+    def load(cls, source: str, source_file: str) -> Transformer:
+        """
+        Instantiate specified transformer class and populate with source records.
+
+        Args:
+            source: Source repository label. Must match a source key from config.SOURCES.
+            source_file: A file containing source records to be transformed.
+        """
+        transformer_class = cls.get_transformer(source)
+        source_records = transformer_class.parse_source_file(source_file)
+        transformer = transformer_class(source, source_records)
+        return transformer
+
+    @final
+    @classmethod
+    def get_transformer(cls, source: str) -> type[Transformer]:
+        """
+        Return configured transformer class for a source.
+
+        Source must be configured with a valid transform class path.
+
+        Args:
+            source: Source repository label. Must match a source key from config.SOURCES.
+
+        """
+        module_name, class_name = SOURCES[source]["transform-class"].rsplit(".", 1)
+        source_module = import_module(module_name)
+        return getattr(source_module, class_name)
+
+    @classmethod
     @abstractmethod
-    def get_optional_fields(self, xml: Tag) -> Optional[dict]:
+    def parse_source_file(cls, source_file: str) -> Iterator[JSON | Tag]:
+        """
+        Parse source file and return source records via an iterator.
+
+        Must be overridden by format subclasses.
+
+        Args:
+            source_file: A file containing source records to be transformed.
+        """
+        pass
+
+    @abstractmethod
+    def get_optional_fields(self, source_record: JSON | Tag) -> Optional[dict]:
+        """
+        Retrieve optional TIMDEX fields from a source record.
+
+        Must be overridden by source subclasses.
+
+        Args:
+            source_record: A single source record.
+        """
+        return {}
+
+    @classmethod
+    @abstractmethod
+    def get_main_titles(cls, source_record: JSON | Tag) -> list[Tag | str]:
+        """
+        Retrieve main title(s) from an source record.
+
+        Must be overridden by source subclasses.
+
+        Args:
+            source_record: A single source record.
+        """
+        return []
+
+    @classmethod
+    @abstractmethod
+    def get_source_record_id(cls, source_record: JSON | Tag) -> str:
+        """
+        Get or generate a source record ID from a source record.
+
+        Must be overridden by source subclasses.
+
+        Args:
+            source_record: A single source record.
+        """
+        return ""
+
+    @classmethod
+    @abstractmethod
+    def record_is_deleted(cls, source_record: JSON | Tag) -> bool:
+        """
+        Determine whether record has a status of deleted.
+
+        Must be overridden by source subclasses.
+
+        Args:
+            source_record: A single source record.
+        """
+        return False
+
+    @abstractmethod
+    def get_required_fields(self, source_record: JSON | Tag) -> dict:
+        """
+        Get required TIMDEX fields from a source record.
+
+        Must be overridden by format subclasses.
+
+        Args:
+            source_record: A single source record.
+        """
+        return {}
+
+    @abstractmethod
+    def transform(self, source_record: JSON | Tag) -> Optional[TimdexRecord]:
+        """
+        Transform a source record into a TIMDEX record.
+
+        Must be overridden by format subclasses.
+
+        Args:
+            source_record: A single source record.
+        """
+        return None
+
+    @classmethod
+    @abstractmethod
+    def get_valid_title(cls, source_record_id: str, source_record: JSON | Tag) -> str:
+        """
+        Retrieves main title(s) from a source record and returns a valid title string.
+
+        Must be overridden by source subclasses.
+
+        Args:
+            source_record_id: Record identifier for the source record.
+            source_record: A single source record.
+        """
+        return ""
+
+    @classmethod
+    @abstractmethod
+    def get_source_link(
+        cls, source_base_url: str, source_record_id: str, source_record: JSON | Tag
+    ) -> str:
+        """
+        Class method to set the source link for the item.
+
+        Must be overridden by source subclasses.
+
+        Args:
+            source_base_url: Source base URL.
+            source_record_id: Record identifier for the source record.
+            source_record: A single source record.
+        """
+        return ""
+
+    @classmethod
+    @abstractmethod
+    def get_timdex_record_id(
+        cls, source: str, source_record_id: str, source_record: Tag
+    ) -> str:
+        """
+        Class method to set the TIMDEX record id.
+
+        Must be overridden by source subclasses.
+
+        Args:
+            source: Source name.
+            source_record_id: Record identifier for the source record.
+            source_record: A single source record.
+        """
+        return ""
+
+
+class XmlTransformer(Transformer):
+    """Base transformer class."""
+
+    @final
+    @classmethod
+    def parse_source_file(cls, source_file: str) -> Iterator[Tag]:
+        """
+        Parse XML file and return source records as bs4 Tags via an iterator.
+
+        May not be overridden.
+
+        Args:
+            source_file: A file containing source records to be transformed.
+        """
+        with open(source_file, "rb") as file:
+            for _, element in etree.iterparse(
+                file,
+                tag="{*}record",
+                encoding="utf-8",
+                recover=True,
+            ):
+                record_string = etree.tostring(element, encoding="utf-8")
+                record = BeautifulSoup(record_string, "xml")
+                yield record
+                element.clear()
+
+    @abstractmethod
+    def get_optional_fields(self, source_record: Tag) -> Optional[dict]:
         """
         Retrieve optional TIMDEX fields from an XML record.
 
         Must be overridden by source subclasses.
 
         Args:
-            xml: A BeautifulSoup Tag representing a single XML record
+            source_record: A BeautifulSoup Tag representing a single XML record
         """
         return {}
 
     @classmethod
     @abstractmethod
-    def get_main_titles(cls, xml: Tag) -> list[Tag]:
+    def get_main_titles(cls, source_record: Tag) -> list[Tag]:
         """
         Retrieve main title(s) from an XML record.
 
         Must be overridden by source subclasses.
 
         Args:
-            xml: A BeautifulSoup Tag representing a single XML record
+            source_record: A BeautifulSoup Tag representing a single XML record
         """
         return []
 
     @classmethod
-    def get_source_record_id(cls, xml: Tag) -> str:
+    def get_source_record_id(cls, source_record: Tag) -> str:
         """
         Get or generate a source record ID from an XML record.
 
         May be overridden by source subclasses if needed.
 
         Args:
-            xml: A BeautifulSoup Tag representing a single XML record
+            source_record: A BeautifulSoup Tag representing a single XML record
         """
-        return str(xml.header.find("identifier").string)
+        return str(source_record.header.find("identifier").string)
 
     @classmethod
-    def record_is_deleted(cls, xml: Tag) -> bool:
+    def record_is_deleted(cls, source_record: Tag) -> bool:
         """
         Determine whether record has a status of deleted.
 
         May be overridden by source subclasses if needed.
 
         Args:
-            xml: A BeautifulSoup Tag representing a single XML record
+            source_record: A BeautifulSoup Tag representing a single XML record
         """
-        if xml.find("header", status="deleted"):
+        if source_record.find("header", status="deleted"):
             return True
         return False
 
     @final
-    def get_required_fields(self, xml: Tag) -> dict:
+    def get_required_fields(self, source_record: Tag) -> dict:
         """
         Get required TIMDEX fields from an XML record.
 
         May not be overridden.
 
         Args:
-            xml: A BeautifulSoup Tag representing a single OAI-PMH XML record.
+            source_record: A BeautifulSoup Tag representing a single OAI-PMH XML record.
         """
-        source_record_id = self.get_source_record_id(xml)
+        source_record_id = self.get_source_record_id(source_record)
 
         # run methods to generate required fields
-        source_link = self.get_source_link(self.source_base_url, source_record_id, xml)
-        timdex_record_id = self.get_timdex_record_id(self.source, source_record_id, xml)
-        title = self.get_valid_title(source_record_id, xml)
+        source_link = self.get_source_link(
+            self.source_base_url, source_record_id, source_record
+        )
+        timdex_record_id = self.get_timdex_record_id(
+            self.source, source_record_id, source_record
+        )
+        title = self.get_valid_title(source_record_id, source_record)
 
         return {
             "source": self.source_name,
@@ -131,25 +382,25 @@ def get_required_fields(self, xml: Tag) -> dict:
         }
 
     @final
-    def transform(self, xml: Tag) -> Optional[TimdexRecord]:
+    def transform(self, source_record: Tag) -> Optional[TimdexRecord]:
         """
-        Transform an OAI-PMH XML record into a TIMDEX record.
+        Transform an XML record into a TIMDEX record.
 
         May not be overridden.
 
         Args:
-            xml: A BeautifulSoup Tag representing a single OAI-PMH XML record.
+            source_record: A BeautifulSoup Tag representing a single XML record.
         """
-        if self.record_is_deleted(xml):
-            source_record_id = self.get_source_record_id(xml)
+        if self.record_is_deleted(source_record):
+            source_record_id = self.get_source_record_id(source_record)
             timdex_record_id = f"{self.source}:{source_record_id.replace('/', '-')}"
             raise DeletedRecord(timdex_record_id)
-        optional_fields = self.get_optional_fields(xml)
+        optional_fields = self.get_optional_fields(source_record)
         if optional_fields is None:
             return None
         else:
             fields = {
-                **self.get_required_fields(xml),
+                **self.get_required_fields(source_record),
                 **optional_fields,
             }
 
@@ -163,7 +414,7 @@ def transform(self, xml: Tag) -> Optional[TimdexRecord]:
 
     @final
     @classmethod
-    def get_valid_title(cls, source_record_id: str, xml: Tag) -> str:
+    def get_valid_title(cls, source_record_id: str, source_record: Tag) -> str:
         """
         Retrieves main title(s) from an XML record and returns a valid title string.
 
@@ -175,9 +426,9 @@ def get_valid_title(cls, source_record_id: str, xml: Tag) -> str:
 
         Args:
             source_record_id: Record identifier for the source record.
-            xml: A BeautifulSoup Tag representing a single XML record.
+            source_record: A BeautifulSoup Tag representing a single XML record.
         """
-        all_titles = cls.get_main_titles(xml)
+        all_titles = cls.get_main_titles(source_record)
         if len(all_titles) > 1:
             logger.warning(
                 "Record %s has multiple titles. Using the first title from the "
@@ -199,7 +450,7 @@ def get_valid_title(cls, source_record_id: str, xml: Tag) -> str:
 
     @classmethod
     def get_source_link(
-        cls, source_base_url: str, source_record_id: str, xml: Tag
+        cls, source_base_url: str, source_record_id: str, source_record: Tag
     ) -> str:
         """
         Class method to set the source link for the item.
@@ -211,14 +462,16 @@ def get_source_link(
         Args:
             source_base_url: Source base URL.
             source_record_id: Record identifier for the source record.
-            xml: A BeautifulSoup Tag representing a single XML record.
+            source_record: A BeautifulSoup Tag representing a single XML record.
                 - not used by default implementation, but could be useful for subclass
                     overrides
         """
         return source_base_url + source_record_id
 
     @classmethod
-    def get_timdex_record_id(cls, source: str, source_record_id: str, xml: Tag) -> str:
+    def get_timdex_record_id(
+        cls, source: str, source_record_id: str, source_record: Tag
+    ) -> str:
         """
         Class method to set the TIMDEX record id.
 
@@ -229,7 +482,7 @@ def get_timdex_record_id(cls, source: str, source_record_id: str, xml: Tag) -> s
         Args:
             source: Source name.
             source_record_id: Record identifier for the source record.
-            xml: A BeautifulSoup Tag representing a single XML record.
+            source_record: A BeautifulSoup Tag representing a single XML record.
                 - not used by default implementation, but could be useful for subclass
                 overrides
         """