Sorry, I read your post incorrectly. Modifying the xml (and not the xsd ) with a specific prefix on the flag attribute works, but it will be difficult for users to pick that approach (specify attribute code with no namespace prefix and flag with a prefix). Since I need to just externalize the type, I can get it to work with: | <xsd:simpleType name="module-option-flag"> | <xsd:restriction base="xsd:string"> | <xsd:enumeration value="required"/> | <xsd:enumeration value="requisite"/> | <xsd:enumeration value="sufficient"/> | <xsd:enumeration value="optional"/> | </xsd:restriction> | </xsd:simpleType> | | <xsd:complexType name="loginModuleInfo"> | .... | <xsd:attribute name="code" type="xsd:string" use="required"/> | <xsd:attribute name="flag" type="jbsx:module-option-flag" use="required"/> | </xsd:complexType> | I can move on. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4074571#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...