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

  <define name='feBlend'>
    <element name='feBlend'>
      <ref name='feBlend.attr'/>
      <ref name='svg.feBlend.content'/>
    </element>
  </define>

  <define name='feBlend.attr' combine='interleave'>
    <ref name='svg.Core.attr'/>
    <ref name='svg.FilterColor.attr'/>
    <ref name='svg.FilterPrimitiveWithIn.attr'/>
    <attribute name='in2'/>
    <optional>
      <attribute name='mode' a:defaultValue='normal'>
        <choice>
          <value>normal</value>
          <value>multiply</value>
          <value>screen</value>
          <value>darken</value>
          <value>lighten</value>
        </choice>
      </attribute>
    </optional>
  </define>
