  <define name='svg.feDropShadow.content'>
    <zeroOrMore>
      <choice>
        <ref name='animate'/>
        <ref name='set'/>
      </choice>
    </zeroOrMore>
  </define>

  <define name='feDropShadow'>
    <element name='feDropShadow'>
      <ref name='attlist.feDropShadow'/>
      <ref name='svg.feDropShadow.content'/>
    </element>
  </define>

  <define name='attlist.feDropShadow' combine='interleave'>
    <ref name='svg.Core.attrib'/>
    <ref name='svg.FilterColor.attrib'/>
    <ref name='svg.FilterPrimitiveWithIn.attrib'/>
	
	<optional>
      <attribute name='dx'>
        <ref name='Coordinate.datatype'/>
      </attribute>
    </optional>
    <optional>
      <attribute name='dy'>
        <ref name='Coordinate.datatype'/>
      </attribute>
    </optional>
    <optional>
      <attribute name='stdDeviation'>
        <ref name='NumberOptionalNumber.datatype'/>
      </attribute>
    </optional>
  </define>
