diff --git a/apps/iiif/manifests/admin.py b/apps/iiif/manifests/admin.py
index 6a39b171..50288374 100644
--- a/apps/iiif/manifests/admin.py
+++ b/apps/iiif/manifests/admin.py
@@ -39,7 +39,7 @@ class RelatedLinksInline(admin.TabularInline):
     exclude = ("id",)
     fields = (
         "link",
-        "data_type",
+        "is_structured_data",
         "format",
     )
     extra = 1
diff --git a/apps/iiif/manifests/migrations/0060_relatedlink_is_structured_data.py b/apps/iiif/manifests/migrations/0060_relatedlink_is_structured_data.py
new file mode 100644
index 00000000..dfaea844
--- /dev/null
+++ b/apps/iiif/manifests/migrations/0060_relatedlink_is_structured_data.py
@@ -0,0 +1,38 @@
+# Generated by Django 3.2.12 on 2023-12-05 19:59
+
+from django.db import migrations, models
+
+
+def populate_is_structured_data(apps, schema_editor):
+    # Data migration to populate RelatedLink.is_structured_data for existing data
+    RelatedLink = apps.get_model("manifests", "RelatedLink")
+    rl_set = RelatedLink.objects.all()
+    for rl in rl_set:
+        # Assume all existing RelatedLinks are structured data, since they were previously only
+        # being added in Remote ingests when there was an existing manifest (which is structured
+        # data)
+        rl.is_structured_data = True
+    RelatedLink.objects.bulk_update(rl_set, ["is_structured_data"], batch_size=1000)
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("manifests", "0059_alter_relatedlink_id"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="relatedlink",
+            name="is_structured_data",
+            field=models.BooleanField(
+                default=False,
+                help_text="True if this link is structured data that should appear in the manifest's 'seeAlso' field; if false, the link will appear in the 'related' field instead. Leave unchecked if unsure.",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="relatedlink",
+            name="data_type",
+            field=models.CharField(default="Dataset", max_length=255),
+        ),
+        migrations.RunPython(populate_is_structured_data, migrations.RunPython.noop),
+    ]
diff --git a/apps/iiif/manifests/models.py b/apps/iiif/manifests/models.py
index f5d5cc85..f5471103 100644
--- a/apps/iiif/manifests/models.py
+++ b/apps/iiif/manifests/models.py
@@ -288,12 +288,12 @@ def external_links(self):
             "see_also": [
                 link.link
                 for link in related_links
-                if link.data_type.lower() == "dataset"
+                if link.is_structured_data
             ],
             "related": [
                 link.link
                 for link in related_links
-                if link.data_type.lower() != "dataset"
+                if not link.is_structured_data
             ],
         }
 
@@ -304,18 +304,15 @@ def see_also_links(self):
         :return: List of links to structured data describing Manifest
         :rtype: list
         """
-        links = []
-        for link in self.relatedlink_set.all():
-            if link.data_type.lower() == "dataset":
-                links.append(
-                    {
-                        "@id": link.link,
-                        "format": link.format,
-                    }
-                    if link.format
-                    else link.link
-                )
-        return links
+        return [
+            {
+                "@id": link.link,
+                "format": link.format,
+            }
+            if link.format
+            else link.link
+            for link in self.relatedlink_set.filter(is_structured_data=True)
+        ]
 
     # TODO: Is this needed? It doesn't seem to be called anywhere.
     # Could we just use the label as is?
@@ -398,9 +395,12 @@ class RelatedLink(models.Model):
     data_type = models.CharField(
         max_length=255,
         default='Dataset',
-        help_text="Leave as 'Dataset' for structured data describing this document (e.g. a " +
-        "remote manifest) and this link will appear in 'seeAlso'; change to any other value and " +
-        "it will only appear in the 'related' property of the manifest.",
+    )
+    is_structured_data = models.BooleanField(
+        default=False,
+        help_text="True if this link is structured data that should appear in the manifest's " +
+        "'seeAlso' field; if false, the link will appear in the 'related' field instead. Leave " +
+        "unchecked if unsure.",
     )
     label = GenericRelation(ValueByLanguage)
     format = models.CharField(max_length=255, choices=Choices.MIMETYPES, blank=True, null=True)
diff --git a/apps/iiif/manifests/tests/tests.py b/apps/iiif/manifests/tests/tests.py
index 16be42f3..42ffed92 100644
--- a/apps/iiif/manifests/tests/tests.py
+++ b/apps/iiif/manifests/tests/tests.py
@@ -177,7 +177,7 @@ def test_serialized_related_links(self):
         )
         assert not no_links['seeAlso']
 
-        link = RelatedLink(link='images.org', manifest=manifest)
+        link = RelatedLink(link='images.org', manifest=manifest, is_structured_data=True)
         link.save()
         manifest.refresh_from_db()
 
diff --git a/apps/ingest/services.py b/apps/ingest/services.py
index 365283df..47f829d3 100644
--- a/apps/ingest/services.py
+++ b/apps/ingest/services.py
@@ -58,7 +58,7 @@ def create_related_links(manifest, related_str):
             manifest=manifest,
             link=link,
             format=format or "text/html",  # assume web page if MIME type cannot be determined
-            data_type="Document",  # assume this is not meant for seeAlso
+            is_structured_data=False,  # assume this is not meant for seeAlso
         )
 
 def create_manifest(ingest):
@@ -108,7 +108,8 @@ def create_manifest(ingest):
         RelatedLink(
             manifest=manifest,
             link=ingest.remote_url,
-            format='application/ld+json'
+            format='application/ld+json',
+            is_structured_data=True,
         ).save()
 
     return manifest