Ontology-Extensions.md

+# OiN 
+## Extension for source Classes:
+```SPARQL
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX owl: <http://www.w3.org/2002/07/owl#>
+PREFIX ecrm: <http://erlangen-crm.org/170309/>
+INSERT DATA { 
+    GRAPH <http://objekte-im-netz.fau.de/ontology/common/> {
+        <http://objekte-im-netz.fau.de/ontology/common/S143_Source-Content> a owl:Class .
+        <http://objekte-im-netz.fau.de/ontology/common/S143_Source-Content> rdfs:subClassOf ecrm:E73_Information_Object .
+        <http://objekte-im-netz.fau.de/ontology/common/S144_Source> a owl:Class .
+        <http://objekte-im-netz.fau.de/ontology/common/S144_Source> rdfs:subClassOf ecrm:E22_Man-Made_Object .        
+    }
+} 
+```
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