public   static   Document   parse(org.w3c.dom.Document   doc)   throws   Exception   {           if   (doc   ==   null)   {               return   (null);           }           org.dom4j.io.DOMReader   xmlReader   =   new   org.dom4j.io.DOMReader();           return   (xmlReader.read(doc));       }                public   static   org.w3c.dom.Document   parse(Document   doc)   throws   Exception   {           if   (doc   ==   null)   {               return   (null);           }           java.io.StringReader   reader   =   new   java.io.StringReader(doc.asXML());           org.xml.sax.InputSource   source   =   new   org.xml.sax.InputSource(reader);           javax.xml.parsers.DocumentBuilderFactory   documentBuilderFactory   =                   javax.xml.parsers.DocumentBuilderFactory.newInstance();           javax.xml.parsers.DocumentBuilder   documentBuilder   =   documentBuilderFactory.                   newDocumentBuilder();           return   (documentBuilder.parse(source));       }