Re: [xml-dev] RELAX NG require oneOrMore optional elements

[Bjoern Hoehrmann <derhoermi@gmx.net>]

* Frank Cusack wrote:
>Is it possible to require one or more from a list of optional elements?
>If I have something like:
>
><element name="parent">
> <oneOrMore>
>  <interleave>
>    <optional>
>     <element name="child1">
>      <text/>
>     </element>
>    </optional>
>    <optional>
>     <element name="child2">
>      <text/>
>     </element>
>    </optional>
>  </interleave>
> </oneOrMore>
></element>
>
>My intent is that <parent> must have at least 1 of the child elements.
>But python-lxml (which I guess is libxml2) doesn't flag
>
><parent />
>
>as erroneous.

You can add a Schematron rule that specifies the additional constraint,
but then you need a RELAX NG + Schematron validator, or you can list the
many alternative, but that would quickly become very verbose.
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