XML serialization of SPARQL

Bijan was saying that he wants an XML serialization for SPARQL.

While on IRC with Hugo, I doodled:

  CONSTRUCT { ?a foo ?b . ?b bar ?c }
      WHERE { ?b thoip ?c . ?c fump ?d . ?a wonk ?d }

 =>

  <sparql>
    <construct>
      <term><s var="a"/><p uri="foo"/><o var="b"/></term>
      <term><s var="a"/><p uri="foo"/><o var="b"/></term>
    </construct>
    <where>
      <term><s var="b"/><p uri="thiop"/><o var="c"/></term>
      <term><s var="c"/><p uri="fump"/><o var="d"/></term>
      <term><s var="a"/><p uri="wonk"/><o var="d"/></term>
    </where>
  </sparql>

I can see that this would enable one to use a SOAP SPARQL Protocol
binding to sign and/or encrypt. There may be other motivations.
What are they?
-- 
-eric

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