xpath - Merge xml file in ant script -

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Required:

Insert the following servicelet into web.xml if not already there : 

  & lt; Servlet & gt; & Lt; Details & gt; My service & lt; / Description & gt; & Lt; Servlet-name & gt; MyServlet & lt; / Servlet-name & gt; & Lt; Servlet category & gt; Com.tom.servlet.MyServlet & lt; / Servlet category & gt; & Lt; Load-On-Startup & gt; 1 & lt; / Load-on-startup & gt; & Lt; / Servlet & gt; & Lt; Servlet-mapping & gt; & Lt; Servlet-name & gt; MyServlet & lt; / Servlet-name & gt; & Lt; URL pattern & gt; / Servlet / myServlet / * & lt; / URL pattern & gt; & Lt; / Servlet-mapping & gt;   
 I am using my ant script  
 tried the following script, but failed:  
   & Lt; Insert = "servletfound" path = "/ web-app / servlet [last ()]" after position = "& gt; & Lt ;! [CDATA [& lt; Servlet & gt; & Lt; Details & gt; My service & lt; / Description & gt; & Lt; Servlet-name & gt; MyServlet & lt; / Servlet-name & gt; & Lt; Servlet category & gt; Com.tom.servlet.MyServlet & lt; / Servlet category & gt; & Lt; Load-On-Startup & gt; 1 & lt; / Load-on-startup & gt; & Lt; / Servlet & gt; & Lt; Servlet-mapping & gt; & Lt; Servlet-name & gt; MyServlet & lt; / Servlet-name & gt; & Lt; URL pattern & gt; / Servlet / myServlet / * & lt; / URL pattern & gt; & Lt; / Servlet-mapping & gt; ]] & Gt; & Lt; / Insert & gt; & Lt; / Xmltask & gt;   
 My question is how to find out whether the servlet is there or not, because I should refrain from inserting it twice. My xpath grammar does not seem right please help.   
 
 
 You tried to expose:  
  / web-app / servlet [Servlet-name = 'myServlet'] / text ()   
 ... text text nodes that are   direct label    , Which is not present in the XML sample, if you are to return text nodes instead of  Direct Child's  & lt; Servlet-name & gt;  , then XPath should do something like this:  
  / web-app / servlet / servlet-name [ = 'MyServlet'] / text ()

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