Arguably not the task of the schema
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  1. lookup rules 
    <if test="document('lookup.xml')/people/person[@id=current::@ref]">
         <message>this person does not exist in the database</message>
</if>
  2. usage rules 
    The <emph> element should be used to mark linguistic,
not typographic emphasis
  3. house rules 
    Use the <biblStruct> element rather than <bibl>
wherever possible
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