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        <!-- this attribute just returns the username as logged in via JAAS -->
        <resolver:AttributeDefinition id="principal" xsi:type="PrincipalName" 
           dependencyOnly="true" xmlns="urn:mace:shibboleth:2.0:resolver:ad">
             <resolver:AttributeEncoder xsi:type="SAML2StringNameID"         
                xmlns="urn:mace:shibboleth:2.0:attribute:encoder"
                nameFormat="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified" />
        </resolver:AttributeDefinition>

        <!-- This attribute is the above principal name with the kerb realm
             (e.g. CAMPUS.EDU) split out via regex -->
        <resolver:AttributeDefinition xsi:type="RegexSplit" dependencyOnly="true"
           xmlns="urn:mace:shibboleth:2.0:resolver:ad" id="regex_principal_split"
           sourceAttributeID="principal" regex="^(.*?)@CAMPUS.EDU$">
              <resolver:Dependency ref="principal" />
        </resolver:AttributeDefinition>