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Friday, November 24, 2006
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Last Call Working Draft Review for Basic XML Schema Patterns for Databinding.  Here is some more information on this W3C Working Group:

"The W3C XML Schema Patterns for Databinding Working Group, part of the W3C Web Services Activity, has released two working drafts for review.The mission of this Working Group is to define a set of XML Schema patterns that will be efficiently implementable by the broad community who use XML databindings. Patterns which may prove useful to model include abstractions of structures common across a wide variety of programming environments, such as hash tables, vectors, and collections.

There are several ways of representing such abstracted data structures and Web Services toolkits are currently using ad hoc technologies to infer the most suitable language mapping when processing XML Schemas.Agreeing on a set of XML Schema patterns for which databinding optimizations can be made will facilitate the ability of Web services and other toolkits to expose a more comprehensible data model to the developer.

The WG has published a First Public Working Draft for "Advanced XML Schema Patterns for Databinding Version 1.0." This document defines an advanced set of example XML Schema 1.0 constructs and types in the form of concrete XPath 2.0 expressions. These patterns are known to be in widespread use and considered to be compatible with databinding implementations. Implementers of databinding tools may find these patterns useful to represent simple and common place data structures. Ensuring tools recognize at least these simple XML Schema 1.0 patterns and present them in terms most appropriate to the specific language, database or environment will provide an improved user experience when using databinding tools.

The WG has also issued a Last Call Working Draft for the "Basic XML Schema Patterns for Databinding Version 1.0" specification. A databinding tool generates a mapping between XML 1.0 documents which conform to an XML Schema 1.0 schema and an internal data representation. For example, a Web services databinding tool may use XML Schema 1.0 descriptions inside a WSDL 2.0 or WSDL 1.1 document to produce and consume XML and SOAP messages in terms of data structures in a programming language or data held inside a database."

Given that the impedance mismatch between XML Schema and Language Types are one of the major causes of Interoperability problems in web services toolkits, this work and these documents are definitely worth checking out.

11/24/2006 4:29 PM Eastern Standard Time  |  Comments [0]  |  Disclaimer  |  Permalink   
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