Hi I'm running an elementary Subject Scheme test to learn how to use it later for producing a full taxonomy, followed the simple instructions at http://www.oxygenxml.com/doc/ug-editor/topics/subject-scheme-map.html. However, when using the attribute defined in the subject scheme map, and although auto completion recognizes its defined values; I get the error: Attribute "p-doc" must be declared for element type "p", where "p-doc" is the 'attributedef' name within the 'enumerationdef' element. Subject scheme file validates well and ditamap file references the subject scheme file. The three files are attached. Would appreciate any directions about this. Khaled ---------------------------------------------------------------- Khaled A.B. Aly, Senior Author & Analyst in ICT Technopsis Research; Cairo, Egypt (GMT+2)