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RELAX NG require oneOrMore optional elements

Is it possible to require one or more from a list of optional elements?
If I have something like:

<element name="parent">
     <element name="child1">
     <element name="child2">

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.  Note that my actual list of child elements is quite long.

I also tried <oneOrMore><choice>...</choice></oneOrMore> and removing
all the <optional> wrappers.  This does require that at least one child
be present but doesn't prevent repetition of child elements.  I thought
about adding xsd:maxOccurrence attributes to each child element but
I'm not sure how to get the RelaxNG parser to understand them.


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