Re: random url for namespace to avoid uncontrollable

No problems at all, use whatever namespace you like.  You could just
use xmlns:cms="cms", it really doesn't matter.  Just don't put dates
or version numbers in it, or anything that might give you reason to
want to change it down the line.

I tend to use data urls when I would previously have used a string eg
xmlns:cms="data:,cms" rather than xmlns:cms="cms"

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