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W3C XML Schema
| Birthplace: |
W3C |
| Age: |
7 months |
| Parents: |
SOX, XDR, DDML, … |
| Type: |
Grammar |
| Formalism: |
ad hoc. A formalism is being developed. |
| Syntax: |
XML instance |
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Explicit type hierarchy with subclassing by restriction or extension
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Provides a detailed PSVI to downstream applications
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Includes a rich library of built-in datatypes
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Extension and restriction of built-in datatypes with facets
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Does not support co-constraints
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Schema instance namespaced attributes are always allowed
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Requires instance modification (xsi:type attribute) to enforce some constraints