Tres Seaver wrote:
One example of such an implementation would be an optional, lxml-based
directive which uses the native structure of the ZCML file and XPath.
E.g. to include only adapters from a package ::

  <select package="my.package" file="configure.zcml">

The XPath processor would need to be passed the current namespace
mapping here, if we want to select items from the non-default namespace.
Otherwise, this would function pretty much like the 'include' directive
(it might even use that diretive's handler under the hood).

With an egg-based story, we can more easily use stuff which depends on a
third-party library like lxml;  folks who can't install lxml just lose
this feature.

In general, I don't like relying on the syntactic structure of ZCML files for this. I'd prefer to have a semantic of configuration actions and a way to disable them.

If this can be a quick fix that helps people, so be it, but I think a way to manipulate configuration actions from Python code is a better overall approach.



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