[Zope3-Users] Re: ZCML, practicality, purity (was "Excellent
shane at hathawaymix.org
Thu Dec 22 11:47:35 EST 2005
>>Are you sure ZCML is The Right Way? I know its purpose (since I helped
>>invent Zope 3): to combine configurations by multiple developers without
>>imposing a particular workflow. However, I maintain that Python code could
>>do the job better. The Python code I have in mind is not the same as
>>Jeffrey's examples. I'll elaborate if there's interest.
> *ping* for interest in elaboration on the code you have in mind...
Ok. Here are two snippets that express the same thing. First in ZCML:
Now in Python (hypothetical):
from zope.app import rotterdam
All functionality and capabilities of ZCML are retained, but there are
important, subtle differences.
- I could conceivably type configuration directives at the interactive
Python prompt. I could use the standard dir() and help() functions to
find out what directives exist and how to use them.
- If I want to register a lot of similar things, in ZCML I have to
either repeat myself, leading to poor maintainability, or create new
directives, leading to directive proliferation. In Python I can use
variables, loops, functions, etc., reusing skills I already know.
- If I want to debug a registration, I can use pdb or any other Python
- Code snippets can include both the code and the default configuration
(yet users are not forced to use the configuration), making code samples
Those are the technical arguments. There is also the marketing argument
that a lot of the target audience has been burned by XML, but I don't
think that's the right basis for making a decision. I sincerely believe
Python code would be better than XML for the technical reasons I listed
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