does do some things.
1. A public ID is recognized as Just A
2. A public ID has a means to be resolved that is
indirect and extensible.
3. A public ID is clearly an identifier for an owner,
class description, version number, and language.
4. A public ID may use a registry process. For
those who like that sort of thing, it is possible. It
does enable those who choose to cooperate a
5. As a level of indirection, it is no worse than
URI to RDDL. RDDL isn't a standard and
isn't even widely deployed. Domain control
fine and you have that. Others might consider
worthwhile to control a namespace without
reference to the Internet, DNS, or other systemic
resources. They may wish to clearly and functionally
state that the owner of the namespace is Owner,
that the Class is Class, that the Version is Version,
that the Language is Language, and so on. That
a bit more flexible than the Domain name, actually
for most of the reasons you point out. It is precisely
because companies go out of business or change
organizations that some prefer public identifiers for
published resources. It is less corrosive.
is an alternative being explored to avoid reinvention.
That alone may be worth some time invested. One
should look at the other options.
If one insists that a namespace label is only a label
and want to avoid the wink-wink nudge-nudge that
has been the way of the Namespace Rec since
was published, an alternative is to use the
form of that which is clearly Just A Name, and
the standard from OASIS that provides a means
resolve that to a location should one so choose.
All things on the Internet Are Not The Web. All
things in XML are Not On the Internet.
Using PUBLIC ids instead of
URIs/URLs/URCompletelyConfusedByAllTheAvailableAcronyms doesn't solve the
problem in the slightest, just moves it somewhere else. Companies will go
out of business or change the organization of their publicly available
resources. Networks will go down and computers will do things for "no
apparent reason"(TM). Hackers will spoof web sites and send viruses
instead of whatever it was you really wanted.
If two people choose to use the same string for their
namespace URI, tough. It can happen, learn to live with it. If I use a URI
that starts with my domain name, I can be fairly sure that no one else can
control what is "there"(TM), hackers notwithstanding. If I choose to use
someone else's domain name, then I can hardly complain if my applications
break because of it.
It is an imperfect world, learn to live with it.
The XML Management Company
+31 (0)20 750 7582 / +31 (0)6 55 347 448 /
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