Re: [xml-dev] Element as value of another Element

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

At 2008-01-15 07:50 -0800, Shashank Gupta wrote:
>I want to define an element of type string such that it's value can 
>be either of :
>-any string
>-value of another element of type string
>
>I am using Schema.

Using W3C Schema 1.0 you cannot express that as a constraint.

>Something like :
><xs:simpleType name="a" value = any string OR another element b of 
>type string>

Using the ISO/IEC 19757-3 Schematron assertion-based constraint 
language you can express your desired constraint, but it is run 
separately from W3C Schema.

Off hand I'm not sure if the future W3C Schema 1.1 can help in this 
regard ... I suspect that it can since it supports co-occurrence 
constraints, but I don't know if there are limits.

I hope this helps.

. . . . . . . . . . . . . Ken

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