diff --git a/src/metldata/builtin_transformations/add_content_properties/__init__.py b/src/metldata/builtin_transformations/add_content_properties/__init__.py
new file mode 100644
index 0000000..9cd318f
--- /dev/null
+++ b/src/metldata/builtin_transformations/add_content_properties/__init__.py
@@ -0,0 +1,20 @@
+# Copyright 2021 - 2024 Universität Tübingen, DKFZ, EMBL, and Universität zu Köln
+# for the German Human Genome-Phenome Archive (GHGA)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""A transformation to add content properties."""
+
+from metldata.builtin_transformations.add_content_properties.main import (
+    ADD_CONTENT_PROPERTIES_TRANSFORMATION,  # noqa: F401
+)
diff --git a/src/metldata/builtin_transformations/add_content_properties/instruction.py b/src/metldata/builtin_transformations/add_content_properties/instruction.py
index 5b56771..e74a5d4 100644
--- a/src/metldata/builtin_transformations/add_content_properties/instruction.py
+++ b/src/metldata/builtin_transformations/add_content_properties/instruction.py
@@ -20,31 +20,14 @@
 from pydantic import Field
 from pydantic_settings import BaseSettings
 
+from metldata.builtin_transformations.common import NewContentSchemaPath
+
 DEFAULT_CONTENT_SCHEMA: Final[dict[str, Any]] = {
     "type": "object",
     "additionalProperties": False,
 }
 
 
-class NewContentSchemaPath(BaseSettings):
-    """A model describing the path of an object property within the content schema that
-    is yet to be added. The model comprises a path to an already existing object within
-    the content schema and the name of a property to be added to that object's schema
-    """
-
-    object_path: str = Field(
-        ...,
-        description=(
-            "The path to the content object to which a property shall be added. The"
-            + " path must be specified in dot notation, equivalently to JavaScript"
-            + " property accessors."
-        ),
-        examples=["some_property.another_nested_property"],
-    )
-
-    property_name: str = Field(..., description="The name of the property to be added.")
-
-
 class AddContentPropertyInstruction(BaseSettings):
     """A model describing an instruction to add a new content property to a class in a
     schemapack, including an associated default value in corresponding data.
diff --git a/src/metldata/builtin_transformations/common/__init__.py b/src/metldata/builtin_transformations/common/__init__.py
new file mode 100644
index 0000000..448eb34
--- /dev/null
+++ b/src/metldata/builtin_transformations/common/__init__.py
@@ -0,0 +1,20 @@
+# Copyright 2021 - 2024 Universität Tübingen, DKFZ, EMBL, and Universität zu Köln
+# for the German Human Genome-Phenome Archive (GHGA)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Common models and functions for the built-in transformations."""
+
+from metldata.builtin_transformations.common.contentschema import (
+    NewContentSchemaPath,  # noqa: F401
+)
diff --git a/src/metldata/builtin_transformations/common/contentschema.py b/src/metldata/builtin_transformations/common/contentschema.py
new file mode 100644
index 0000000..55de406
--- /dev/null
+++ b/src/metldata/builtin_transformations/common/contentschema.py
@@ -0,0 +1,37 @@
+# Copyright 2021 - 2024 Universität Tübingen, DKFZ, EMBL, and Universität zu Köln
+# for the German Human Genome-Phenome Archive (GHGA)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Models and functions related to content schema manipulation."""
+
+from pydantic import Field
+from pydantic_settings import BaseSettings
+
+
+class NewContentSchemaPath(BaseSettings):
+    """A model describing the path of an object property within the content schema that
+    is yet to be added. The model comprises a path to an already existing object within
+    the content schema and the name of a property to be added to that object's schema
+    """
+
+    object_path: str = Field(
+        ...,
+        description=(
+            "The path to the content object to which a property shall be added. The"
+            + " path must be specified in dot notation, equivalently to JavaScript"
+            + " property accessors."
+        ),
+        examples=["some_property.another_nested_property"],
+    )
+
+    property_name: str = Field(..., description="The name of the property to be added.")
diff --git a/tests/fixtures/transformations.py b/tests/fixtures/transformations.py
index 35e6e37..c5a0eb8 100644
--- a/tests/fixtures/transformations.py
+++ b/tests/fixtures/transformations.py
@@ -23,10 +23,10 @@
 from schemapack.spec.datapack import DataPack
 from schemapack.spec.schemapack import SchemaPack
 
-from metldata.builtin_transformations.add_content_properties.main import (
+from metldata.builtin_transformations.add_content_properties import (
     ADD_CONTENT_PROPERTIES_TRANSFORMATION,
 )
-from metldata.builtin_transformations.delete_properties.main import (
+from metldata.builtin_transformations.delete_properties import (
     PROPERTY_DELETION_TRANSFORMATION,
 )
 from metldata.builtin_transformations.infer_relations import (