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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 1.2, January 26, 2022.
The only changes between versions 1.2 and 1.1 were to add the Quality and Functionality factors for the new Aggregate content category. These changes will not invalidate existing FDDs available on this site. As FDDs are updated, they will refer to version 1.2 of the schema.
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.
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: