To learn more about XML attribute declarations, see the following URL:
http://www.w3.org/TR/2004/REC-xml-20040204/#attdecls
WebLogic Workshop uses XML Schemas (and not DTDs) for the validation of XML. To learn more about XML attribute declarations with XML Schemas, see the following URL:
http://www.w3.org/TR/xmlschema-1/#cAttribute_Declarations