This module defines subclasses of the dictionaries defined in the annotations module. The subclasses are used to attach metadata about revision control status of a file (the RCS* types), dublin core metadata and common web formats (XHTML, RSS). a simple key/value pair, where key must be /^date$/, and value must be of the pattern /^$Date: .*\$$/ a simple key/value pair, where key must be /^rev$/, and value must be of the pattern /^$Rev: .*\$$/ a simple key/value pair, where key must be /^author$/, and value must be of the pattern /^$Author: .*\$$/ a simple key/value pair, where key must be /^url$/, and value must be of the pattern /^$URL: .*\$$/ a simple key/value pair, where key must be /^id$/, and value must be of the pattern /^$Id: .*\$$/ a simple key/value pair, where key must be /^header$/, and value must be of the pattern /^$Header: .*\$$/