XSLT: How to change an attribute value during ?

Question

I have an XML document, and I want to change the values for one of the attributes.

First I copied everything from input to output using:

Answer 1

This problem has a classical solution: Using and overriding the identity template is one of the most fundamental and powerful XSLT design patterns:

When applied on this XML document:

  value1
  value2

the wanted result is produced:

  value1
  value2