Defining Element Content Models

• ref   

  <elementRule role="name">
    <ref label="givenName"/>
  </elementRule>

• sequence   

  <elementRule role="name">
    <sequence>
      <ref label="givenName"/>
      <ref label="familyName"/>
    </sequence>
  </elementRule>

• choice   

  <elementRule role="name">
    <choice occurs="+">
      <ref label="givenName"/>
      <ref label="familyName"/>
    </choice>
  </elementRule>

• The occurs attribute    can take *, +, or ? as values, just like DTDs.

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