Filename clashes in datadir

Hey, I just noticed something about pyblosxom. What if I have the
following two files in my datadir:

	foo.txt
	foo.markdown

The first is handled by the built-in entry parser, the second by the
markdown entry parser plugin. Both entries will appear in pyblosxom's
index pages. But both have the same permalink URL:

	${base_url}/foo

So when someone visits that URL in a browser, which entry should
pyblosxom render? It seems to pick one or the other but I'm not how it
makes the decision.

I guess blosxom must have this problem also?

The problem is caused by using different filename extensions in datadir
to select the entry parser. If instead you required all entries to have
the same filename extension (maybe .txt, or .entry) then by the
properties of the filesystem it would be impossible for the user to
create two entries with the same permalink URL. Entry parser plugins
could be specified in the optional metadata section inside the entry
files instead.

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