diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 5f8b0fa5..b047b4f4 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -23,6 +23,7 @@ jobs:
 
         schema:
         - CGMES_2.4.15_27JAN2020
+        - CGMES_3.0.0
 
     steps:
       - name: Checkout repo
@@ -40,10 +41,15 @@ jobs:
 
           pip install .
 
+          # Extract version (2.4.15 => 2_4_15), ignore the date part
+          SCHEMA_VERSION=$(echo "${{matrix.schema}}" | cut -d'_' -f2 | cut -d'.' -f1-3 | tr '.' '_')
+
+          # Run cimgen with the valid version
           cimgen \
-            --outdir=output/${{matrix.language}} \
+            --outdir=output/${{matrix.language}}/${{matrix.schema}} \
             --schemadir=cgmes_schema/${{matrix.schema}} \
-            --langdir=${{matrix.language}}
+            --langdir=${{matrix.language}} \
+            --cgmes_version=cgmes_v${SCHEMA_VERSION}
 
       - name: Create artifact
         uses: actions/upload-artifact@v4
diff --git a/.gitignore b/.gitignore
index f58c6d1d..d8c0846c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ output/
 *.py[cod]
 __pycache__/
 .vscode/*
+*/.DS_Store
+.DS_Store
diff --git a/Makefile b/Makefile
index e1b7b033..0b2c7aed 100644
--- a/Makefile
+++ b/Makefile
@@ -9,15 +9,19 @@ else
 	LANGUAGE_DEPS = image
 endif
 
+# Extract version from SCHEMA (CGMES_2.4.15_27JAN2020 => 2_4_15)
+CGMES_VERSION=$(subst .,_,$(wordlist 2,4,$(subst _, ,$(SCHEMA))))
+
 all: $(LANGUAGES)
 
 $(LANGUAGES): $(LANGUAGE_DEPS)
 	$(CIMGEN) \
 		--outdir=output/$@/$(SCHEMA) \
 		--schemadir=cgmes_schema/$(SCHEMA) \
-		--langdir=$@
+		--langdir=$@ \
+		--cgmes_version=cgmes_v$(CGMES_VERSION)
 
 image:
 	docker build -t cimgen -f Dockerfile .
 
-.PHONY: all image python modernpython java javascript
+.PHONY: all image $(LANGUAGES)
diff --git a/README.md b/README.md
index 601b8da6..771be1c8 100644
--- a/README.md
+++ b/README.md
@@ -19,8 +19,19 @@ cimgen --outdir=output/cpp/CGMES_2.4.15_27JAN2020 --schemadir=cgmes_schema/CGMES
 
 This will build version `CGMES_2.4.15_27JAN2020` in the subfolder `output/cpp/CGMES_2.4.15_27JAN2020`.
 
-If you wish to build an alternative version, you can see available options in the subfolder called `cgmes_schema`.
-For the schema `CGMES_3.0.0` you have to use the option `--cgmes_version=cgmes_v3_0_0`.
+> [!NOTE]
+> If you wish to build an alternative version, you can see available options in the subfolder called `cgmes_schema`.
+> For the schema `CGMES_3.0.0` you have to use the option
+> `--cgmes_version=cgmes_v3_0_0`. `outdir` can be set to whichever absolute path you wish to create the files in.
+
+Alternatively, you can leverage `Makefile`:
+
+```bash
+pip install -e .
+#unset BUILD_IN_DOCKER # if you previously set to use docker
+#export SCHEMA=CGMES_3.0.0 # to use CGMES 3.0.0
+make cpp
+```
 
 #### Generating C++ files in a Docker container
 
@@ -29,6 +40,14 @@ docker build --tag cimgen --file Dockerfile .
 docker run --volume "$(pwd)/output:/output" cimgen --outdir=/output/cpp/CGMES_2.4.15_27JAN2020 --schemadir=/cimgen/cgmes_schema/CGMES_2.4.15_27JAN2020 --langdir=cpp --cgmes_version=cgmes_v2_4_15
 ```
 
+alternatively, you can leverage `Makefile`:
+
+```bash
+export BUILD_IN_DOCKER=true
+#export SCHEMA=CGMES_3.0.0 to use CGMES 3.0.0
+make cpp
+```
+
 ### Generating Python files
 
 #### Generating Python files on Linux
@@ -38,7 +57,14 @@ pip install -e .
 cimgen --outdir=output/python/CGMES_2.4.15_27JAN2020 --schemadir=cgmes_schema/CGMES_2.4.15_27JAN2020 --langdir=python --cgmes_version=cgmes_v2_4_15
 ```
 
-`outdir` can be set to whichever absolute path you wish to create the files in.
+alternatively, you can leverage `Makefile`:
+
+```bash
+pip install -e .
+#unset BUILD_IN_DOCKER # if you previously set to use docker
+#export SCHEMA=CGMES_3.0.0 # to use CGMES 3.0.0
+make python
+```
 
 #### Generating Python files in a Docker container
 
@@ -47,6 +73,49 @@ docker build --tag cimgen --file Dockerfile .
 docker run --volume "$(pwd)/output:/output" cimgen --outdir=/output/python/CGMES_2.4.15_27JAN2020 --schemadir=/cimgen/cgmes_schema/CGMES_2.4.15_27JAN2020 --langdir=python --cgmes_version=cgmes_v2_4_15
 ```
 
+alternatively, you can leverage `Makefile`:
+
+```bash
+export BUILD_IN_DOCKER=true
+#export SCHEMA=CGMES_3.0.0 to use CGMES 3.0.0
+make python
+```
+
+### Generating Modern Python (i.e. PyDantic based dataclasses) files
+
+#### Generating Modern Python files on Linux
+
+```bash
+pip install -e .
+cimgen --outdir=output/modernpython/CGMES_2.4.15_27JAN2020 --schemadir=cgmes_schema/CGMES_2.4.15_27JAN2020 --langdir=modernpython --cgmes_version=cgmes_v2_4_15
+```
+
+`outdir` can be set to whichever absolute path you wish to create the files in.
+
+alternatively, you can leverage `Makefile`:
+
+```bash
+pip install -e .
+#unset BUILD_IN_DOCKER # if you previously set to use docker
+#export SCHEMA=CGMES_3.0.0 # to use CGMES 3.0.0
+make modernpython
+```
+
+#### Generating Modern Python files in a Docker container
+
+```bash
+docker build --tag cimgen --file Dockerfile .
+docker run --volume "$(pwd)/output:/output" cimgen --outdir=/output/modernpython/CGMES_2.4.15_27JAN2020 --schemadir=/cimgen/cgmes_schema/CGMES_2.4.15_27JAN2020 --langdir=modernpython --cgmes_version=cgmes_v2_4_15
+```
+
+alternatively, you can leverage `Makefile`:
+
+```bash
+export BUILD_IN_DOCKER=true
+#export SCHEMA=CGMES_3.0.0 to use CGMES 3.0.0
+make modernpython
+```
+
 ## License
 
 This project is released under the terms of the [Apache 2.0 license](./LICENSE).