- From: Jeni Tennison <jeni@jenitennison.com>
- Date: Thu, 29 Aug 2002 19:04:45 +0100
- To: xmlschema-dev@w3.org, "Stanley Guan" <stanley.guan@oracle.com>
- CC: www-xml-schema-comments@w3.org
Hi Stanley, > To conclude, there are only the following possibilities: > 1. use="optional" default="1.0" > valid: <doc /> or > <doc version="1.0" /> or > <doc version="2.0" Yep. > 2. use="prohibited" fixed="1.0" > valid: <doc /> > invalid: <doc version="1.0" /> or > <doc version="2.0" Nope. use="prohibited" is only used when you're deriving a type by restriction and you want to say "elements of this type cannot have this attribute". When you derive a type by restriction, all the attributes from the base type are inherited by the restricted type *unless* you specify use="prohibited". If you try to specify a default or fixed value on an xs:attribute with use="prohibited", it'll just get ignored. > 3. use="required" fixed="1.0" > valid: <doc version="1.0" /> > invalid: <doc version="2.0" /> or > <doc /> Yep. > 4. use="optional" fixed="1.0" > valid: <doc version="1.0" /> or <doc /> > invalid: <doc version="2.0" /> Yep. So in fact there are five combinations if you include ones without value constraints: optional without default or fixed value optional with default value optional with fixed value required without default or fixed value required with fixed value Cheers, Jeni --- Jeni Tennison http://www.jenitennison.com/
Received on Thursday, 29 August 2002 14:04:52 UTC