Error trying to import a a daml file in protege
I'm trying to import a daml file (.daml (daml is an extention of RDF which is written in xml)) in protege, but I get the following exception:
Does any of you know how to get around this? Does any of you know any other powerful ontology app. dvelopment environment other than protege for developing daml+oil documents?
Exception in thread "AWT-EventQueue-0" java.lang.noClassDefFoundError: org/apache/xerces/utils/URI$MalformedURIException
Please reply as soon as you can. Thanks in advance.