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An official document intended primarily for supporting procurement, which document clearly and accurately describes the essential technical requirements for items, materials, or services, including the procedures by which it will be determined that the requirements have been met.
Archivist's Note: From 2003 to 2005, the RSS Advisory Board reported revisions to this document with change notes but did not increment the version number in the specification itself.
All date-times in RSS conform to the Date and Time Specification of RFC 822, with the exception that the year may be expressed with two characters or four characters (four preferred).
Prior to RSS 2.0, the specification only allowed http:// and ftp://, however, in practice other URI schemes were in use by content developers and supported by aggregators.