xml-dev - Re: Schema Question: Attributes

[ht@cogsci.ed.ac.uk (Henry S. Thompson)]

Michael Anderson <michael@research.canon.com.au> writes:

> Does the use of xsi:type in an instance allow the derived type's
> attributes to appear in the markup, or is only the derived content model
> allowed?  For example.
> 
> In the XML Schema Document
> <element name="A" type="AType" />
> 
> <complexType name="AType">
>   <attribute name="attrA" type = "NCName" />
> </complexType>
> 
> <complexType name="BType" base="AType" derivedBy="extension">
>   <attribute name="attrB" type = "NCName" />
> </complexType>
> 
> In the XML Instance Document
> <A xsi:type="BType" attrA="someName" attrB="someOtherName" />
> 
> Is this okay?  Or is only attrA allowed?

It's OK.  When xsi:type is provided and its value is allowed, the type 
definition it resolves to is used to schema-validate the whole element 
information item, that is, attributes and content.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/

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