In November 2007, I attended an ontology conference in Columbia, MD. During the conference, Steven Robertshaw stated that there is no standard ontology editor since each editor renders, validates a OWL document differently. OWL is a W3C standard for ontologies. I agree with Robertshaw's statement because the OWL document which I created from Protege did not validate on Altova's SemanticWorks OWL editor. When I fixed the OWL document for the SemanticWorks tool then it wouldn't work on Protege.
Altova's XMLSpy generated WSDL does not validate well on Cape Clear's WSDL editor called SOAEditor. WSDL is a W3C approved XML specification for web service contracts. Sometimes certain editors look for attributes in a different place. I have used Mindreef's SoapScope to test a WSDL which is approved by all WSDL editors.
While I was doing in depth analysis on Global Justice XML Data Model (GJXDM) for Department of Homeland Security, I created XML Schemas using XMLSpy
Going back to my last blog entry, XML based modeling technologies have too many quirks and this is because how the technologies have implemented various XML specifications. This type of confusion is NOT needed by a data modeler. Before I start any modeling exercise, I would say, "Where is my Protege? "