For each PDF/A-1 validation issue we try to explain what it means and, if possible how to resolve it. For a more technical explanation of the issue we quote the related section of the ISO 19005-1 PDF/A Specification.
Metadata is essential for effective management of a file throughout its life cycle. A file depends on metadata for identification and description, as well as for describing appropriate technical and administrative matters. As a result, writers of conforming files may have to comply with various domain-specific metadata requirements defined external to this part of ISO 19005. This part of ISO 19005 outlines a structured, consistent framework that supports a broad variety of metadata requirements.