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Digital Formats Descriptions as XML
The HTML versions on the Web site are produced via an XSLT transformation, and they carry this explanatory comment: <!--This HTML FDD was generated using an XSLT transformation from an XML master FDD, based on version 1.1 of the FDD schema.-->.
XML Schema for Format Descriptions
Version 1.1, November 11, 2016.
The only changes between version 1.1 and 1.0 were to the enumerated lists in the schema: (a) adding a few signifier types including Pronom PUID and a generic FOURCC type and (b) adding application domains for email and cad/cam. These changes will not invalidate existing FDDs available on this site. As FDDs are updated, they will refer to version 1.1 of the schema.
Previous version: 1.0, July 20, 2012.
XML Format Description Documents
XML descriptions may also be accessed individually if the identifier is known, using the following path- and file-name pattern: //www.loc.gov/preservation/digital/formats/fddXML/fddnnnnnn.xml. Here's an example. The HTML version of the main PDF description is here: