diff --git a/webapp/web/WEB-INF/filegraph/tbox/vitroPublic.owl b/webapp/web/WEB-INF/filegraph/tbox/vitroPublic.owl
index d1f51520a..3e4afaf2a 100644
--- a/webapp/web/WEB-INF/filegraph/tbox/vitroPublic.owl
+++ b/webapp/web/WEB-INF/filegraph/tbox/vitroPublic.owl
@@ -48,6 +48,11 @@
 	<rdfs:range rdf:resource="&xsd;string"/>
 </owl:DatatypeProperty>
 
+<owl:DatatypeProperty rdf:about="#directDownloadUrl">
+	<rdfs:domain><owl:Class rdf:about="#FileByteStream"/></rdfs:domain>
+	<rdfs:range rdf:resource="&xsd;string"/>
+</owl:DatatypeProperty>
+
 <owl:ObjectProperty rdf:about="#downloadLocation">
 	<rdfs:domain><owl:Class rdf:about="#File"/></rdfs:domain>
 	<rdfs:range><owl:Class rdf:about="#FileByteStream"/></rdfs:range>