Common validation error messages from PDF to PDFA conversion

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Title
Common validation error messages from PDF to PDFA conversion
Detailed description The validation error messages found from two pieces of validation software when performed on the same [file:
]From PDFBox Preflight:
Invalid font definition
Syntax Error: invalid float range in Number operand
Invalid color space...
From Adobe Preflight
CIDset in subset font is incomplete
Font not embedded
Syntax problem: Real value out of range (too high) (also commonly get the other extreme - too low)
A detailed description of the Issue. The Issue MUST focus on the busines or preservation driven challenge, and should not assume or prescribe a particular solution. Describe what the Issue is, why you have the Issue, and what your requirements are for a Solution. For example, it might be important that a technical solution runs on UNIX, or has a GUI front end and is easy to use, or needs to process records efficiently as the Dataset is large.
Issue champion Who owns the issue? Type "[" and then your name to use autocomplete. This creates a link to your user profile on the wiki, including your contact details, so is the best way to add your name..
Other interested parties
Any other parties who are also interested in applying Issue Solutions to their Datasets.
Possible Solution approaches Brief brainstorm of possible approaches to solving the Issue. Each approach should be described in a single sentence as part of a bulleted list. Further detail can go in a dedicated Solution page.
Context Details of the institutional context to the Issue.
Lessons Learned Notes on Lessons Learned from tackling this Issue that might be useful to inform digital preservation best practice .
Datasets Reference to the appropriate Dataset page, by hyperlink. Note that all Issues MUST be linked to at least one Dataset!
Solutions Reference to the appropriate Solution page(s), by hyperlink.
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