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> I too would like to know of a PDF validator. Currently I have 
> found that
> using a variety of Acrobat versions, Zeon, and GhostView 
> together can flush
> out problems. Sometimes GhostView is the best too because it 
> is a little
> pickier than Acrobat and gives better error messages.

A big problem would be defining whether you want a strict
or a useful validator.

A strict validator could be written using the PDF Reference. 
However, it would reject a huge proportion of PDF files.  For
programmers making PDF files that would nevertheless be 
helpful.

But a useful validator would have to know about the valid PDFs
that are rejected by Acrobat, and the bad features that nevertheless
display correctly.

I did something similar with PSAlter, for PostScript, but since
validation was an afterthought, it only has about 20 items it
specifically complains of in its "strict conformance" mode.

Aandi

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