<and>
  <expr>
    <define name="email" args="to body">
      <add>
	<string>From user@localhost&#10;</string>
	<string>To: </string>
	<to/>
	<string>&#10;</string>
	<string>&#10;</string>
	<body/>
	<string>&#10;</string>
      </add>
    </define>

    <eq>
      <email to="authors@ebt.com">hello</email>
      <email>
	<define name="to">authors@ebt.com</define>
	hello
      </email>
    </eq>
  </expr>

  <print x="2"><define name="x">3</define><x/></print>
</and>
