Groups

• group defines a model that can be used as a particle in other models

• Like a sequence in W3C schemas or parentheses in DTDs

Allow a NAME element to contain either plain text or a GIVEN and a FAMILY but not both:

<element name="NAME>
  <choice>
    <text/>
    <group>
       <interleave>
         <element name="GIVEN">
           <text/>
         </element>
         <element name="FAMILY">
           <text/>
         </element>
       </interleave>
    </group>
  </choice>
</element>