I would like to create a data property of type URL in protege, but I cannot see ant URL among the available data types. Is it possible to create a data property of type URL in protege?
Protégé is based on the OWL 2 Web Ontology Language. According to the OWL2 specification:
The OWL 2 datatype map provides the xsd:anyURI XML Schema datatype for the representation of IRIs.
To answer you question, use xsd:anyURI to represent URLs in Protégé.