怎么由字符串生成DOM对象－－在线等待，马上给分！

String sFile = "Query.xml";
try {
DocumentBuilderFactory docbuilderfactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docbuilder = docbuilderfactory.newDocumentBuilder();
doc = docbuilder.parse(sFile);
} catch (Exception e) {
System.out.println("Cannot read the command file: "+e.getMessage());
}
这是从一个文件中创建，如果想从一个字符串中创建，如：
String sXML="

1<query name="aaa">aaaa</query>

"
应该怎么做？
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InputSource source = new InputSource (new StringReader (sXML));
doc = docbuilder.parse (source);