short notes is a journal on software, systems, engineering practices among other things.
Copyright © 2002-2006 short notes. All rights reserved.    contact address: email to the editor   ISSN 1543-6489

short notes
 
Monday, 1. July 2002

XML schema languages, PSVI, Infoset


Out of many candidates for XML schema language W3C XML Schema is the only one to introduce PSVI or post-schema validation infoset. PSVI is returned by schema processor analogous to how Infoset is returned by parsers. Infoset is "an abstract data set ... that provides ... definitions to refer to the information in a well-formed XML document"; PSVI works for validated and well-formed XML document. PSVI provides not only information on validation of an XML document but also type information on elements and attributes as well as their default values. And yet even W3C working group does not have use cases!

PSVI inevitably raises many questions:

Especially PSVI's type system already generates strong objections and dissents like "One typesys to rule them, and in the darkness bind them."

PSVI will affect the future of XML profoundly, or will it?
 

 
Published since 2002-04-23
Updated: 2010-10-16
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