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No, union are not usable within complex types.

> Pierre,
> 
> This can be done with Union types [1].
> 
> Kind Regards,
> Joe Chiusano
> Booz | Allen | Hamilton
> 
> [1] http://www.w3.org/TR/2001/REC-xmlschema-0-20010502/primer.html#UnionDt
> 
> GARNIER Pierre wrote:
> > 
> > Hi,
> > 
> > Here are two <time> elements differing only in there content :
> > 
> > 1)
> > <doc>
> >   <time>14:09<time>
> > </doc>
> > 
> > 2)
> > <doc>
> >   <time><hour>14</hour><min>09</min></time>
> > </doc>
> > 
> > In an XSD schema, how to indicate that the <time> element can contain 
> > text and only text or <hour> tag followed by <min> tag?
> > 
> > I tried with a choice group containing two <time> elements with 
> > different types but it doesn't work : it is not possible to have two 
> > elements with the same name.
> > 
> > Thanks.
> > Pierre.
> > 
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