ISO 19444-1:2019

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ISO 19444-1:2019 specifies an XML format for representing forms data and annotations within the Portable Document Format (PDF), specifically using ISO 32000-2 (PDF 2.0). This standard defines XFDF (XML Forms Data Format), which is the XML equivalent of FDF files, which are a simplified version of PDF for representing forms data and annotations. Essentially, it's a way to store and exchange form data and annotation information using XML within a PDF document.