After some trying out of various things I've finally started in earnest on an integration of rdflib in zope. Rdflib+zOPE=ROPE... So that'll be the name. I'm not entirely sure how big a task and how big a deal it will be, but I'm guessing "moderate" and "really nice" respectively.
Being my first zope product made on the filesystem instead of using zclasses, I figured it might come in handy to write the whole process down. If not for myself, then as an addition to the list of available howtos.
So I'll try to regularly give a status update here. First time I do a thing like this on a weblog, but I'm all in for this experiment. This afternoon, I walked through the ZDG (zope developers guide), chapter three: "zope products". During this process I managed to bash together a tiny hello-world-quality program. Do this yourself, it should give you a little bit of zopy feeling in your fingers.
I probably shouldn't mention that this hello world took me two hours (including reading the chapter of course) in zope compared to the usual 0.5 to 5 minutes in other languages. But I suspect that you, honored reader, have half a hunch that spending a bit up-front costs on learning zope will reap you great benefits later on. At least, that was my thought. I'm betting heavily on it that learning coding in zope will improve my general internet-coding productivity by an order of magnitude. It's a bit of intuition. But, being a good engineer, I'm trusting my intuition.
This afternoon I also requested a sourceforge project for this, as I thought it would be something useful. Otherwise just keep it on your local harddisk. But use cvs!* You'll save yourself from the worst of accidental deletions, wrong turns taken during development and version mismatches. I've been smiling all day because the name Rope wasn't taken yet. Rdflib + zope = rope makes for a pretty well-explainable name and it's nice and short. When I thought of that name (literally after 15 seconds) I didn't expect the name to be free :-)
This evening I set up a directory at home and created the usual empty
CHANGELOG. Just having them
there makes it look better. I knew of some limitations (python version
2.2 or above for instance), so I put that into the
document. I copied the BSD-style license from rdflib and changed the
name of the author.
CHANGELOG is still empty, but I even typed in
the project's goal into the
README. It is never too early to start
documenting. And documenting is what I plan to do well. Nothing
hurts a potentially good project as much as missing or bad
Ok, back to the ZDG (for the last time: Zope Developers Guide),
chapter three. This tells me to start with an interface, being a good
description of the functionality of the product. Well, Daniel
Krech has done a good job on rdflib and already
defined it for us. He didn't actually call it an interface, but
nonetheless. In your rdflib directory, look up
rdflib/store/AbstractTripleStore.py. Ok, there's some implementation
in there, but most of it is left blank for other impelementations to
The next step is to implement it. Well, basically we can choose the
standard in-memory implementation
rdflib/store/BTreeStore.py, which uses (applause
please) the zope standalone database. Standalone in this case means
that it opens it's own database etcetera, so it doesn't sound very
like the automatic persistence normally enjoyed by zope products. I
tried rdflib's standalone zodb storage and it works very well. But for
the moment I'm going to bet that the in-memory storage will be just
fine, as zope should be able to store that in-memory thingy
automatically just fine. I'll leave optimising to a later stage.
Well, enough for one evening, I'm going to take a shower and snuggle up to Annie :-)
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My name is Reinout van Rees and I work a lot with Python (programming language) and Django (website framework). I live in The Netherlands and I'm happily married to Annie van Rees-Kooiman.
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