import com.sun.xml.internal.rngom.xml.sax.XMLReaderCreator; //导入依赖的package包/类
/**
 * Parses a RELAX NG grammar into an annotated grammar.
 */
private Model loadRELAXNG() throws SAXException {

    // build DOM forest
    final DOMForest forest = buildDOMForest( new RELAXNGInternalizationLogic() );

    // use JAXP masquerading to validate the input document.
    // DOMForest -> ExtensionBindingChecker -> RNGOM

    XMLReaderCreator xrc = new XMLReaderCreator() {
        public XMLReader createXMLReader() {

            // foreset parser cannot change the receivers while it's working,
            // so we need to have one XMLFilter that works as a buffer
            XMLFilter buffer = new XMLFilterImpl() {
                @Override
                public void parse(InputSource source) throws IOException, SAXException {
                    forest.createParser().parse( source, this, this, this );
                }
            };

            XMLFilter f = new ExtensionBindingChecker(Const.RELAXNG_URI,opt,errorReceiver);
            f.setParent(buffer);

            f.setEntityResolver(opt.entityResolver);

            return f;
        }
    };

    Parseable p = new SAXParseable( opt.getGrammars()[0], errorReceiver, xrc );

    return loadRELAXNG(p);

}
 

import com.sun.xml.internal.rngom.xml.sax.XMLReaderCreator; //导入依赖的package包/类
public SAXParseable(InputSource in, ErrorHandler eh, XMLReaderCreator xrc) {
    this.xrc = xrc;
    this.eh = eh;
  this.in = in;
}