<?xml version="1.0"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0">
    <start>
        <choice>
            <ref name="container.elem" />
            <ref name="data.elem" />
        </choice>
    </start>
    <define name="data.elem">
        <element>
            <name ns="">data</name>
            <text />
        </element>
    </define>
    <define name="container.elem">
        <element>
            <name ns="">container</name>
            <oneOrMore>
                <ref name="data.elem" />
            </oneOrMore>
        </element>
</grammar>