channel is closed and empty.
</p>


<h3 id="Conversions">Conversions</h3>

<p>
A conversion changes the <a href="#Types">type</a> of an expression
to the type specified by the conversion.
A conversion may appear literally in the source, or it may be <i>implied</i>
by the context in which an expression appears.
</p>

<p>
An <i>explicit</i> conversion is an expression of the form <code>T(x)</code>

    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/calendar">
    <magic priority="50">
      <match value="BEGIN:VCALENDAR" type="string" offset="0">
        <match value="\nVERSION:2.0" type="string" offset="15:360"/>
      </match>
    </magic>
    <glob pattern="*.ics"/>
    <glob pattern="*.ifb"/>
    <sub-class-of type="text/plain"/>
  </mime-type>