<schema>
<moduleRef name="teiheader"/>
<moduleref name="verse"/>
<!-- add a new element -->
<elementSpec ident="soundClip">
<classes memberOf="tei.data"/>
 <attList>
  <attDef ident="url">
  <datatype><rng:data type="URI"/></datatype>
  <valDesc>A location path</valDesc>
  <desc>supplies the location of the clip</desc>
  </attDef>
 </attList>
 <desc>includes an audio object in a document.</desc>
</elementSpec>
<!-- change an existing element -->
<elementSpec ident="head" mode="change">
<content><rng:text/></content>
</elementSpec>
</schema>