to be composed in order
to allow validation of the complete document.  The implementation in
Jing fully supports the language described in the
specification. Subschemas can be in any of the languages supported by
Jing (including, recursively, NRL).  Jing does not yet support the
<code>schema</code> option for W3C XML Schema subschemas, which would
allow more than one schema URI to be specified.</dd>

<dt><a href="mns.html">Modular Namespaces (MNS)</a></dt>

<dd><a name="mns"></a>MNS is the predecessor to NR