1 files changed, 37 insertions, 0 deletions
diff --git a/src-py/model/model.py b/src-py/model/model.py
new file mode 100644
index 00000000..33cf9e6a
--- /dev/null
+++ b/src-py/model/model.py
@@ -0,0 +1,37 @@
+class Link():
+    """
+    documentation anchor - this class currently carries no implementation
+    and only acts as a documentation anchor
+    
+    link['__src'] - meta attribute for link source object
+    link['__dst'] - meta attribute for link destination object
+    """
+
+    def __init__(self, src=None, dst=None):
+        assert False, 'currently unused'
+
+    class Link_Ptr(dict):
+        """
+        link['__src_id'] - meta attribute for link source id
+        link['__dst_id'] - meta attribute for link destination id
+        """
+        def __init__(self, src_id=None, dst_id=None):
+            assert None != src_id or None != dst_id
+
+            self['__src_id'] = src_id
+            self['__dst_id'] = dst_id
+
+        @property
+        def src_id(self):
+            return self['__src_id']
+
+        @property
+        def dst_id(self):
+            return self['__dst_id']
+
+    @staticmethod
+    def link_ptr(src_id=None, dst_id=None):
+        """
+        init from src_id or dst_id attributes - at least one must be provided
+        """
+        return Link.Link_Ptr(src_id, dst_id)