<?xml version="1.0" encoding="UTF-8"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:obo_purl="http://purl.obolibrary.org/obo/" xmlns:owl="http://www.w3.org/2002/07/owl#"> <owl:ObjectProperty rdf:about="http://purl.obolibrary.org/obo/has_prefix"> </owl:ObjectProperty> </rdf:RDF>
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:obo_purl="http://purl.obolibrary.org/obo/" xmlns:owl="http://www.w3.org/2002/07/owl#">
  <owl:ObjectProperty rdf:about="http://purl.obolibrary.org/obo/has_prefix">
  </owl:ObjectProperty>
</rdf:RDF>