读取XML到InputStream和则：

Read the xml into a InputStream and then:

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse([the InpuTstream]);

然后你可以使用DOC，如：

Then you can use doc like:

  if(doc.getElementsByTagName("GeometryCollection").getLength()>0){
    org.w3c.dom.Node parent_node = doc.getElementsByTagName("GeometryCollection").item(0);
    NodeList nl = parent_node.getChildNodes();
    for(int i = 0;i<nl.getLength();i++){
     ...