Allow an application to register an entity resolver.
<p>If the application does not register an entity resolver,
the XMLReader will perform its own default resolution.</p>
<p>Applications may register a new or different resolver in the
middle of a parse, and the SAX parser must begin using the new
resolver immediately.</p>
@param resolver The entity resolver.
@see #getEntityResolver
Allow an application to register an entity resolver.
<p>If the application does not register an entity resolver, the XMLReader will perform its own default resolution.</p>
<p>Applications may register a new or different resolver in the middle of a parse, and the SAX parser must begin using the new resolver immediately.</p>
@param resolver The entity resolver. @see #getEntityResolver