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Subject: Substitution Groups - Use 'em or lose 'em?
All,
We are working on extensibility models for standardized business
exchange
schemas. These schemas, under development by several standards organizations make extensive use of hierarchical schemas and namespaces, some of which include schemas developed by third parties. When a user or user community seeks to use these schemas, and, needs to modify them in some way (without altering the underlying standardized schemas), substitution groups can be a powerful and explicit mechanism for such extensions and restrictions. Several participants in these standard schema efforts have expressed reserve from utilizing the W3C mechanism of substitution groups due to their experience with non-uniform support of parsers for this schema feature. In your experience, what are the concerns or recommendations on the incorporation of substitution groups into the naming and design rules of standardized schemas? Should substitution groups be relied upon as an extension mechanism? Marty Burns Hypertek, Inc. P +1(301)315-9101 E burnsmarty@aol.com |
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