<mime-type type="text/vnd.si.uricatalogue"/>
  <mime-type type="text/vnd.sun.j2me.app-descriptor">
    <glob pattern="*.jad"/>
  </mime-type>
  <mime-type type="text/vnd.trolltech.linguist"/>
  <mime-type type="text/vnd.wap.si"/>
  <mime-type type="text/vnd.wap.sl"/>
  <mime-type type="text/vnd.wap.wml">
    <glob pattern="*.wml"/>
  </mime-type>

These conversions may change the representation of <code>x</code>
and incur a run-time cost.
All other conversions only change the type but not the representation
of <code>x</code>.
</p>

<p>
There is no linguistic mechanism to convert between pointers and integers.
The package <a href="#Package_unsafe"><code>unsafe</code></a>
implements this functionality under restricted circumstances.
</p>