I want to remove some XML value without touching core XML files, is it possible ?

The scenario is the following.

In /app/code/core/Mage/Tax/etc/config.xml we have some config value for the totals (<sales><quote><totals>). I want to comment out the tax one so the tax line is not displayed in the frontend.

  • commenting the node in the core XML file works fine but it is not the best approach.
  • If I have put new empy values in a separate module I have a different effect ( it is not like remove the declaration)

In particular I want to do something like:

  • <!--<renderer>tax/checkout_tax</renderer>-->
  • 2
    Is there some reason you can't change the settings under System > Configuration > Tax > Shopping Cart Display Settings to not show tax? Commented Dec 16, 2013 at 20:14
  • it is not exactly the same ... however thanks
    – Fra
    Commented Dec 19, 2013 at 15:48

1 Answer 1


Theoretically inside of your module you can:

  1. in config.xml reset the node to something like <renderer>0</renderer>
  2. register an observer and Mage::getConfig()->setNode('path', NULL)
  • <renderer>0</renderer> is giving me a different result: removing the node from core XML file return null while <renderer>0</renderer> return a string with value 0
    – Fra
    Commented Dec 17, 2013 at 9:17
  • Try putting null instead of 0. If it will not work try option 2. Commented Dec 17, 2013 at 10:08
  • I have already tried both ( 0 and null ) the issue is that they are converted to string ... I think solution 2 is the only one working
    – Fra
    Commented Dec 17, 2013 at 10:40
  • @Francesco, not quite. Solution 1 can be still valid for some cases where setting the value to 0 or something else will do the job. Commented Dec 17, 2013 at 13:01
  • 1
    Hi Tim, I think it is good idea to improve the answer specifying that method 1 is not equivalent to comment out the line in the core file
    – Fra
    Commented Dec 17, 2013 at 14:27

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