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Why does the root layout xml node have a version number:

<layout version="0.1.0">

I have searched the source code and cannot find this being used. Is it a feature that never got implemented? or taken out?

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Vestigial convention which was never implemented. It can be safely ignored/omitted.

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Very good question. I've been wondering the same for a long time, since I worked with Magento 1.0 (some eons ago).
I got to the conclusion that is useless. In my custom modules that have a layout I don't even add the version attribute and it works just fine.
Even for the custom themes where I needed to copy one core layout file to my theme an modify it, I removed the version attribute and it worked.
I can just assume that someone had an idea about layout versioning (or inheritance) that didn't stick. If it was a feature that was taken out it didn't live to see the first release.
This question was asked on the magento forum more than 5 years ago and got no answer

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  • Not even an answer from Moshe? :)
    – philwinkle
    Jun 28, 2013 at 14:34
  • That was my main concern also :)
    – Marius ♦
    Jun 28, 2013 at 14:38

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