XML Change during upgrade

How do you change XML files usually during upgrade?? (Basic MSI)

I think "XML File Changes" Tab has too few function to change old app.config to new app.config. Because many kinds of old app.config have been deployed already, xml change should have enough function to cover all of them.

so, I am considering XSLT 开发者_运维百科and XSLT Processor.

Do you think it is good for xml change?

if not, what can i do alternatively?

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When using a major upgrade the old version is automatically removed before installation starts. So old XML files are deleted and the new ones are installed.

There is no problem in upgrading XML files. You just need to make sure that the XML files in your new version have full functionality and don't rely on older versions.