DTD problem?

<!ELEMENT pdf-settings (embed-font)* >
<!ATTLIST pdf-settings pdf-version (PDF1.3|PDF1.4|PDF1.5|PDF1.6|PDF1.7|
                                     PDF/X-1a:2001|
                                     PDF/X-3:2002|
                                     PDF/X-1a:2003|
                                     PDF/X-2:2003|
                                     PDF/X-3:2003) "PDF1.4">

Jing reports
146:39: fatal: character not allowed
Where line 146 is the first line PDF/X-1a:2001|

Which is the disallowed character please?

TIA


regards

-- 
Dave Pawson
XSLT XSL-FO FAQ.
http://www.dpawson.co.uk