select xml element from web.xml using xmlstarlet -


i'm using xmlstarlet select values web.xml. not working , returns nothing. if web.xml contains following properties:

<web-app version="2.4"    xmlns="java.sun.com/xml/ns/j2ee"    xmlns:xsi="w3.org/2001/xmlschema-instance"    xsi:schemalocation="java.sun.com/xml/ns/j2ee java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

command i'm executing 

xml select -t -v "web-app/display-name" web.xml

how can ignore above ?

if have version 1.5.0, default namespace (java.sun.com/xml/ns/j2ee in case) automatically given prefix _, -n not needed:

xml sel -t -v "_:web-app/_:security-role" /root/web-inf/web.xml

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