I've read the code for adapter registries, how there is a global one and any
number of local ones, arranged in a tree and that each can be disabled.
But I can't figure out when you'd want to make use of such an arrangement.
The docstrings and .txt files use abstract examples, for unit testing, and
don't provide a motivation for this feature.
Related to that, the global registry is loaded at server startup time from the
various .zcml directives, and I presume that the only way to loaded up a local
registry is thru-the-web, right? Which means all local registries are
persistent in the ZODB, I think.
Can anyone nudge me onto the right path?
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