Validate or Pre-Flight PDF file

Hi all,
I'm a programmer with a company that is printing PDF files using HP Indigo presses, which have Harlequin rips to rasterize the PDF file. We occasionally have a file that fails to get ripped, but the rip doesn't really tell me very much about what's wrong with the PDF file. We programatically generate the PDF using a Python library (PDFlib+PDF 6.0.2 (Python 2.3.4/Linux)) and output files look fine in Adobe Acrobat. I realize that Acrobat is very forgiving, so I'm looking for a tool that would validate our PDF files for correctness, or point out problems so we could fix our upstream PDF generation system.
I've looked at and tried some of the pre-flight programs for PDF's, but they all seem to just fix the PDF file rather than tell me anything about where the problem is in the file.
If anyone has any ideas, suggestions or feedback, I'd be very glad to hear it.
Thanks in advance,
Doug Farrell

There don't appear to be any strict validators for PDF. Such problems
are typically very obscure, and even if you know the PDF Specification
from cover to cover, tracking them down doesn't have a high chance.
The thing to do is push your RIP vendor for details, or indeed a fix.
Aandi Inston

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