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On 29 Mar 2006, at 17:23, Tres Seaver wrote:
- - define my own cmfcalendar skin and layer. Declare it as a
combination of layers cmfcalendar, cmf and default.

- - stick my views directly into layer "cmf" and don't worry about
defining my own layeer or skin.


I think the second route is the Right Way to do it with Zope 3 style
layers. I can't see a need to define an extra layer for CMFCalendar.

I still don't think that products should define the default layer, at
least not in the same ZCML file that is used to get all the "normal"
adapter / view registrations configured.

[...]
Both lead to errors like this:

<snip>
    ConfigurationError: ('Invalid value for', 'layer', "ImportError:
Couldn't import cmf, No module named cmf")


I guess the problem is the order in which Five loads the configure.zcml
files. But I have no idea what's the recommended way to make sure
CMFDefault's configure.zcml is loaded first.

%include it into the "dependent" one.

I ended up including it in CMFCalendar/configure.zcml:

<!-- Load CMFDefault.skin first, we use the layer named "cmf" it defines -->
  <include package="Products.CMFDefault.skin"/>

  <include package=".skin"/>

  <include package=".browser"/>

... and it works as expected now. Thanks for the pointers!

jens

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