Sorry, I've overlooked the <optional> element. Rule 4.12 comes first in this case and adds a <group>, then 7.15. The basic idea stays the same: you cannot have several roots in an XML document.



2007/2/7, Radu Cernuta <radu.cernuta@g...>:
It's not about recursion. This won't work because the reference you make in the <start> element is resolved to zeroOrMore elements and a document cannot have several roots. 

See RELAX NG specification:


Simplification, section 4.15 zeroOrMore element
http://relaxng.org/spec-20011203.html#IDAGHZR


Restrictions, section 7.15 start element

http://relaxng.org/spec-20011203.html#context-start


2007/2/7, Jeff Lowery <
jlowery@m...>:
Thanks for your help. I'm thankful for what functionality there is in
RELAX NG, trust me.

Just for kicks I tried self-referencing back to the schema, but
recursion is not allowed (ah well).

Test.rng

:

<?xml version="1.0"?>
<grammar
  xmlns="http://relaxng.org/ns/structure/1.0
"
  ns="http://foo.org/bar
">

    <start>
        <ref name="children"></ref>
    </start>

    <define name="children">
        <zeroOrMore>
            <element>

                <anyName>
                    <except>
                        <nsName/>
                    </except>
                </anyName>
                <ref name="children"></ref>

            </element>
        </zeroOrMore>
        <optional>
            <ref name="interestingElements"></ref>
        </optional>
    </define>



    <define name="interestingElements">
        <choice>
            <externalRef href=""Test.rng"/><br">        </choice>
    </define>

</grammar>