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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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