question: public Source resolveURI ( String base , String urlString , SourceLocator locator ) throws TransformerException , IOException { Source source = null ; if ( null != m_uriResolver ) { source = m_uriResolver . resolve ( urlString , base ) ; } if ( null == source ) { String uri = SystemIDResolver . getAbsoluteURI ( urlString , base ) ; source = new StreamSource ( uri ) ; } return source ; }
target:  This will be called by the processor when it encounters an xsl:include, xsl:import, or document() function.