<list>, <item>, <label>

element list { item+ } 

figure.attributes.url.content = xsd:anyURI

<if test="self::list[@type='gloss'] and not(child::label)">
         <message>gloss lists must have <label> children</message>
</if>

<if test="document('lookup.xml')/people/person[@id=current::@ref]">
         <message>this person does not exist in the database</message>
</if>

Don't use table markup to force layout