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2. History of PDF - Wikipedia

   en.wikipedia.org/wiki/History_of_PDF

   The specifications for PDF are backward inclusive. The PDF 1.7 specification includes all of the functionality previously documented in the Adobe PDF Specifications for versions 1.0 through 1.6. Where Adobe removed certain features of PDF from their standard, they are not contained in ISO 32000-1 either. Some features are marked as deprecated.

3. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   HTML 4.01 Specification since PDF 1.5; HTML 2.0 since 1.2 Forms Data Format (FDF) based on PDF, uses the same syntax and has essentially the same file structure, but is much simpler than PDF since the body of an FDF document consists of only one required object. Forms Data Format is defined in the PDF specification (since PDF 1.2).

4. Geospatial PDF - Wikipedia

   en.wikipedia.org/wiki/Geospatial_PDF

   Geospatial PDF is a set of geospatial extensions to the Portable Document Format (PDF) 1.7 specification to include information that relates a region in the document page to a region in physical space — called georeferencing. [1] A geospatial PDF can contain geometry such as points, lines, and polygons. These, for example, could represent ...

5. XFA - Wikipedia

   en.wikipedia.org/wiki/XFA

   The XML Forms Architecture specification is not included in the PDF 1.7 standard (ISO 32000-1:2008) and it is only referenced as an external proprietary specification created and published by Adobe. However, the ISO 32000-1 references XFA as normative and indispensable for the application of the ISO 32000-1 specification.

6. PDF/A - Wikipedia

   en.wikipedia.org/wiki/PDF/A

   Standard. ISO 19005. PDF/A is an ISO -standardized version of the Portable Document Format (PDF) specialized for use in the archiving and long-term preservation of electronic documents. PDF/A differs from PDF by prohibiting features unsuitable for long-term archiving, such as font linking (as opposed to font embedding) and encryption. [1]

7. PDF/UA - Wikipedia

   en.wikipedia.org/wiki/PDF/UA

   PDF/UA (PDF/Universal Accessibility), formally ISO 14289, is an International Organization for Standardization (ISO) standard for accessible PDF technology. A technical specification intended for developers implementing PDF writing and processing software, PDF/UA provides definitive terms and requirements for accessibility in PDF documents and applications.