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Charter: Printer Working Group Standard Character Repertoire Committee

May 7, 2003

Editor:
Elliott Bradshaw, Oak Technology Imaging Group


Abstract

In traditional printing environments, clients rely on font downloads when they are not sure a given character is embedded in a chosen printer.  As printing moves to small clients, downloading may not be an option and clients have a need to know what characters are available in a given device. 

In Unicode and W3C specifications, the term "character set" usually refers to a method of encoding a (possibly very large) set of characters, e.g. UTF-8.  This tells how to encode a given character if it is present, but doesn't define which characters in that space are actually in use.

The term "character repertoire" is used in the present context to indicate a subset of characters that is actually present for rendering. 

The tasks of this group include:

  1. Define a normative mechanism ("Character Repertoire") by which a printing device (especially an XML-oriented one) can advertise which groups of characters it is able to render.

  2. Produce a technical specification for that mechanism, and support incorporation of that mechanism in the PWG Semantic Model.

  3. Produce Best Practice material recommending usage techniques for that mechanism to improve interoperability.

  4. Consult with other groups (e.g. UPnP) on character repertoire issues.

  5. Study issues of country and language, as they relate to character repertoires.

  6. Study related topics, such as font download and application to non-XML (legacy) PDLs.

 

Schedule of Documents to be Produced

June 2003: Charter approved

Summer/Fall 2003: Specification: The Printer Working Group Standard for Character Repertoire Interoperability

Summer/Fall 2003: Best Practices for use of Character Repertoires

 

References

[IANA-Charsets]
Available online at http://www.iana.org/assignments/character-sets.
[PWG-SM]
PWG Semantic Model.  Available online at http://www.pwg.org/sm/index.html.
[Unicode-Charts]
Unicode code charts.  Available online at http://www.unicode.org/charts.
[Unihan]
Unicode Unihan database, which includes mappings to major CJK character set standards.  Available online at http://www.unicode.org/charts/unihan.html