XML Server Getting Started    
     } catch (e) { 
        util.messageBox("Login failed", e.description); 
The first characteristic element of the above code is the standard sequence of  Java statements related to receiving and parsing 
the input XML: 
      InputSource in = new InputSource(request.getInputStream()); 
      DOMParser parser = new DOMParser(); 
      Node requestRoot = parser.getDocument().getDocumentElement(); 
Next is the way your code can apply XPath statements to  query  the document via XPathAPI: 
      XPathAPI xp = new XPathAPI(); 
       .    .    .   .   .   .  .   
      String userid = getNodeValue(xp.selectSingleNode(requestRoot, "//userid"));  
On the other hand, you can bypass XPathAPI class and use Xalan directly. 
And last, but not least, is the encoding of the `<', `&', and the quote characters, like in the following fragment: 
      StringBuffer sb = new StringBuffer(getStackTraceAsString(e)); 
      StringFunctions.replaceAll(sb, "&", "&"); 
      StringFunctions.replaceAll(sb, "<", "<"); 
      StringFunctions.replaceAll(sb, "\"", """); 
      result = "" + sb.toString() +  "" ; 
Remember, well formed XML should replace these characters with references to predefined entities `<', `&' and 
`"' correspondingly (that is   if presented inside so called  parsed character data . There is an alternative method   
declare a non parsed character or CDATA section.) 
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