[pdftex] Producing PDF/X-3 compatible files

[Ulrich Dirr]

Hi,

I've tried the following to produce a PDF/X-3 compatible output:
\pdfinfo{
   /Title    (Karpov: My Best Games)
   /Author   (Anatoly Karpov)
   /Subject  (Progress in Chess)
   /Keywords (Edition Olms, Karpov, Game Collections, Chess)
   /Trapped  (False)
   /GTS_PDFXVersion (PDF/X-3)
}
\pdfpageattr{/MediaBox [0 0 595.276 841.89]
             /TrimBox [56.69 80.75 538.58 761.065]}
\pdfminorversion=3
\pdfcatalog{
  /OutputIntents [ <<
  /Info (EuroScale Coated v2)
  /Type /OutputIntent
  /S /GTS_PDFX
  /OutputConditionIdentifier (OFCOM_PO_P1_F60)
  /RegistryName (http://www.color.org/)
  >> ]
}

Do you know how I can set Black color to overprint? 

A preflight reported that 'PDF/X label missing or incorrect' and
'Trapped key not of type name'. Do you know how to correct this?

Thanks in advance.

Best regards,
Ulrich Dirr