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Type inheritance in XML schemas - good, bad, ugly ?

452507Feb 2 2006 — edited Apr 2 2008

Consider:

Base type A exists, with some common elements.
Sub-type B "inherits" from type A (somehow), adding new elements, and potentially modifying the inherited elements.
Sub-type C inherits from type B, etc.

XML schema provides in-built mechanisms for type inheritance, such as derive by extension, derive by restriction, and so on.

Any thoughts on whether using XML's in-built inheritance mechanisms is a good idea or not ?

- Should sub-types be in their own namespace ?
- Do we have separate schemas, one per type ? Or one great big schema, containing all sub-types within that ?
- Avoid schema inheritance - each type has it's own independent schema. Propagate any "inherited" changes programatically, from the parent schemas to the sub-type schemas ?

Thoughts on this ?

Thanks,
Andy Mackie

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Locked on Apr 30 2008

Added on Feb 2 2006

#performance-availability, #xml-db

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