Oid refClassId, Oid oldRefObjectId,
Oid newRefObjectId);
-long changeDependenciesOf(Oid classId, Oid oldObjectId,
+extern long changeDependenciesOf(Oid classId, Oid oldObjectId,
Oid newObjectId);
-long changeDependenciesOn(Oid refClassId, Oid oldRefObjectId,
+extern long changeDependenciesOn(Oid refClassId, Oid oldRefObjectId,
Oid newRefObjectId);
extern Oid getExtensionOfObject(Oid classId, Oid objectId);