adapter.aasx: Allow reading AASX with wrong relationship

sdk/basyx/aas/adapter/aasx.py

@@ -143,7 +143,20 @@ def read_into(self, object_store: model.AbstractObjectStore,
         try:
             aasx_origin_part = core_rels[RELATIONSHIP_TYPE_AASX_ORIGIN][0]
         except IndexError as e:
-            raise ValueError("Not a valid AASX file: aasx-origin Relationship is missing.") from e
+            if core_rels.get("http://www.admin-shell.io/aasx/relationships/aasx-origin"):
+                # Since there are many AASX files with this (wrong) relationship URls in the wild, we make an exception
+                # and try to read it anyway. However, we notify the user that this may lead to data loss, since it is
+                # highly likely that the other relationship URLs are also wrong in that file.
+                # See also [#383](https://github.com/eclipse-basyx/basyx-python-sdk/issues/383) for the discussion.
+                logger.warning("SPECIFICATION VIOLATED: The Relationship-URL in your AASX file "
+                               "('http://www.admin-shell.io/aasx/relationships/aasx-origin') "
+                               "is not valid, it should be 'http://admin-shell.io/aasx/relationships/aasx-origin'. "
+                               "We try to read the AASX file anyway, but this cannot guaranteed in the future,"
+                               "and the file may not be fully readable, so data losses may occur."
+                               "Please fix this and/or notify the source of the AASX.")
+                aasx_origin_part = core_rels["http://www.admin-shell.io/aasx/relationships/aasx-origin"][0]
+            else:
+                raise ValueError("Not a valid AASX file: aasx-origin Relationship is missing.") from e
 
         read_identifiables: Set[model.Identifier] = set()