code: function ( uri, silent ) {
  		silent = ( silent === true );
  		if ( cache.items[uri] !== undefined ) {
  			delete cache.items[uri];
  
  			if ( !silent ) {
  				observer.fire( uri, "beforeExpire, expire, afterExpire" );
  			}
  
  			return true;
  		}
  		else {
  			return false;
  		}
  	}
docs: Expires a URI from the local cache
  
  Events: expire    Fires when the URI expires
  
  @method expire
  @private
  @param  {String}  uri    URI of the local representation
  @param  {Boolean} silent [Optional] If 'true', the event will not fire
  @return {Undefined}      undefined