Scoping Element Contents with Attributes

• Attributes for refinement    You can restrict element content based on the value of an attribute.
• Fractions or decimals?   

  <elementRule role="fraction" label="fractionalPart" type="integer">
    <minInclusive value="0"/>
    <maxInclusive value="7"/>
  </elementRule>
  
  <elementRule role="decimal" label="fractionalPart" type="decimal" />
  
  <tag name="fractionalPart" role="fraction" >
    <attribute name="usage" type="string">
      <enumeration value="fraction" />
      <enumeration value="F" />
    </attribute>
  </tag>
  
  <tag name="fractionalPart" role="decimal" >
    <attribute name="usage" type="string">
      <enumeration value="decimal" />
      <enumeration value="D" />
    </attribute>
  </tag>

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