I'm trying to use Oxygen to edit the set of XML-based config files that come with the Shibboleth package. The package is typically installed on linux, as a plugin into a web server such as apache. The package comes with a set of .xsd files, and an accompanying set of xml catalog files. Here's what a typical supplied catalog file looks like: <?xml version="1.0" encoding="UTF-8"?> <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"> <system systemId="urn:oasis:names:tc:SAML:1.0:assertion" uri="/opt/local/shibboleth-sp/share/xml/opensaml/cs-sstc-schema-assertion-1.1.xsd"/> <system systemId="urn:oasis:names:tc:SAML:1.0:protocol" uri="/opt/local/shibboleth-sp/share/xml/opensaml/cs-sstc-schema-protocol-1.1.xsd"/> </catalog> I've tried the following steps: -- downloaded all of the xsd and catalog files to my desktop Mac -- edited the catalog files, changing the file system path in all the uri attributes - launched Oxygen, went to Preferences/XML Catalog, and added the five catalog files that come with the package. - quit Oxygen, re-launched (to have the new Preferences take effect) -- open a Shibboleth xml file, and attempt to validate it I'm presented with an error -- "There is no schema or DTD associated with the document. You can create an association either with the Associate Schema action or from the Options men Preferences/Editor/Default Schema Association." does anyone have a suggestion on a way to get validation to work, using catalog files? Rather than adding everything to the Default Schema Association?