[Zope-dev] Re: zcml entry points

[Tres Seaver]

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Martijn Faassen wrote:
> Tres Seaver wrote:
>> Wichert Akkerman wrote:
> [snip]
>>> So I turned things around: if I state in my egg information that I
>>> require another package that means I need to have that package
>>> available and functional. Which suggests that its zcml has to be loaded
>>> before mine. And that is exactly what I am doing: adding an entry point
>>> that allows a package to say "in order to function I need to have these
>>> zcml files loaded".
>> I may not *want* the other package's ZCML to be loaded:  some of its
>> policies may not be appropriate for my application.  
> 
> Since this appears to be a rare case that is the exception, what about 
> using the new ZCML exclude framework for this case? You need to know 
> what you are doing, but this use case is for people who know exactly 
> what they're doing anyway, right?

It isn't that rare:  how many people want to turn off the Rotterdam skin
in Z3, for instance?  In general, the authors of a "library" package
can't anticipate how their code will be used;  the ZCML they provide is
intended to cover the cases they know or imagine most people want.

ZCML represents policy, not mechanism, and hence is inherently less
reusable than code.


Tres.
- --
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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