• From: Frank Cusack <fcusack@r...>
• To: xml-dev@l...
• Date: Tue, 15 Jul 2008 12:39:55 -0700

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.  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.

-frank

• Follow-Ups:
  • Re: RELAX NG require oneOrMore optional elements
    • From: Frank Cusack <fcusack@r...>
  • Re: RELAX NG require oneOrMore optional elements
    • From: "MURATA Makoto (FAMILY Given)" <eb2m-mrt@a...>
  • Re: RELAX NG require oneOrMore optional elements
    • From: ht@i... (Henry S. Thompson)
  • Re: RELAX NG require oneOrMore optional elements
    • From: Rick Jelliffe <rjelliffe@a...>
  • Re: RELAX NG require oneOrMore optional elements
    • From: Bjoern Hoehrmann <derhoermi@g...>