PDF/A is a specific version of PDF designed for long term archival of electronic data. The idea being that PDF/A files are both self contained and fully specified, so they can be opened in the future without any loss of fidelity.
Implementing PDF/A export is complicated by the fact that the specification is an ISO standard, which is not publicly available. Fortunately, there are PDF/A validators that will tell you if (and sometimes how) your generated PDF/A is invalid. So, given sufficient patience, you can keep throwing PDF files at the validator, fixing the issues reported and repeating this loop over and over until validation passes. Like this:
This will be available in the next release of CapyPDF.
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