I'm working on the survey module, especially on the survey_result.xml file containing all the templates results. I want to change the whole result_matrix template code (the result displayed for all matrix question type) using inheritance. 

So I used :
 

<template name="matrix_result_extended" inherit_id="survey.result_ matrix">
     <xpath expr="." position="replace">
         <!-- custom code here to replace all template code -->
     </xpath>
</template>

But it seems that it doesn't work, because the parent result_matrix is not recognized by the qweb engine anymore when trying to render the survey results.

Is there a clean way to replace all code template by a completely new one ?