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diff --git a/o2dms/domain/dms_repo.py b/o2dms/domain/dms_repo.py
new file mode 100644
index 0000000..f199a3c
--- /dev/null
+++ b/o2dms/domain/dms_repo.py
@@ -0,0 +1,50 @@
+# Copyright (C) 2021 Wind River Systems, Inc.
+#
+#  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.
+
+import abc
+from typing import List, Set
+from o2dms.domain import dms
+
+
+class NfDeploymentDescRepository(abc.ABC):
+    def __init__(self):
+        self.seen = set()  # type: Set[dms.NfDeploymentDesc]
+
+    def add(self, nfdeployment_descriptor: dms.NfDeploymentDesc):
+        self._add(nfdeployment_descriptor)
+        self.seen.add(nfdeployment_descriptor)
+
+    def get(self, nfdeployment_descriptor_id) -> dms.NfDeploymentDesc:
+        nfdeployment_descriptor = self._get(nfdeployment_descriptor_id)
+        if nfdeployment_descriptor:
+            self.seen.add(nfdeployment_descriptor)
+        return nfdeployment_descriptor
+
+    def list(self) -> List[dms.NfDeploymentDesc]:
+        return self._list()
+
+    def update(self, nfdeployment_descriptor: dms.NfDeploymentDesc):
+        self._update(nfdeployment_descriptor)
+
+    @abc.abstractmethod
+    def _add(self, nfdeployment_descriptor: dms.NfDeploymentDesc):
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def _get(self, nfdeployment_descriptor_id) -> dms.NfDeploymentDesc:
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def _update(self, nfdeployment_descriptor: dms.NfDeploymentDesc):
+        raise NotImplementedError