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If you need an additional system to fix the meaning
of the URI (to make it a word), you are adding a
system to a system. At this point, it quits being
Web architecture and starts being Todd architecture.
A URI can identify, not classify. To make it classify,
it needs an additional *coding system* for assigning
meaning. In this sense, it becomes a URN (if not
syntactically, then by coding implementation).
Not distinguising these is what makes the
understanding of the web architecture confusing.
Any time you have a semantic URI, you have a system
on a system. Berners-Lee stumbled because of
calling this a two-level system and thinking
it unnecessary. It is very necessary.
From: Winchel 'Todd' Vincent III [mailto:email@example.com]
If practical experience matters, I have implemented a system where we use
URIs as namespaces and (1) the URIs have (domain-specific) meaning and (2)
there are a number of (fixed) resources at the end of the URIs.
I find there are a great number of advantages to this system. This is not
to say that namespaces that are URIs *must* have meaning or have (fixed)
resource(s) at the end of them (that would be contrary to the spec, after
all), it is simply to say that if you do so and can get others to follow the
system, there are benefits.