Enable CORS in GeoServer with xmlstarlet

doit.sh

xmlstarlet ed --inplace -P \
  -s "//web-app" -t elem -n TEMPNODE -v "" \
  -s "//TEMPNODE" -t elem -n "filter-name" -v "cross-origin" \
  -s "//TEMPNODE" -t elem -n "filter-class" -v "org.eclipse.jetty.servlets.CrossOriginFilter" \
  -r "//TEMPNODE" -v "filter" \
  -s "//web-app" -t elem -n TEMPNODE -v "" \
  -s "//TEMPNODE" -t elem -n "filter-mapping" \
  -s "//TEMPNODE" -t elem -n "filter-name" -v "cross-origin" \
  -s "//TEMPNODE" -t elem -n "url-pattern" -v "/*" \
  -r "//TEMPNODE" -v "filter-mapping" \
  $GEOSERVER_HOME/webapps/geoserver/WEB-INF/web.xml