PDFs are visually focused, not AI-friendly, but transforming tagged PDFs into structured formats such as HTML or XML makes their content accessible to machine learning systems.
Based on PDF/A, the EA-PDF specification defines a specification for a vendor- and platform- neutral format for the long-term preservation of email.
ISO 19444 specifies an XML format for representing forms data and annotations in ISO 32000-2 (PDF 2.0). It is the XML equivalent of FDF.
ISO 21757-1 defines the ECMAScript API for automating and interacting with the 2D and 3D content in PDF 2.0 documents.
This free application note summarizes precisely where PDF creators should add XMP metadata to PDF 2.0 objects, and thus where PDF 2.0 processors should search for it.
To help implementers locate the latest information, the PDF Association maintains a page of links to current versions of documents normatively referenced from ISO 32000-2:2020.