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- From: David Megginson <david@megginson.com>
- To: Bob Kline <bkline@rksystems.com>
- Date: 06 Jan 2000 19:21:58 -0500
Bob Kline <bkline@rksystems.com> writes:
> I'm still trying to absorb all of the intricacies of namespaces, and I
> can see I have a long way to go. I'm looking at the XLink
> recommendation (http://www.w3.org/TR/xlink/) and I see the following:
Here are the tricky points about Namespaces:
1. Namespace URIs are just unique identifiers, like Java or Perl
package names; they don't (necessarily) point to anything.
2. There can be a default Namespace for element names but not for
attribute names.
3. Not withstanding #2, some apps may treat unprefixed attribute names
as if they belong to the same Namespace as the corresponding
element name.
Anything I'm missing? If you want to run through a quick Q-and-A to
make sure you've got it, take a look at the following:
http://www.megginson.com/docs/namespaces/namespace-questions.html
Sure, the stuff about per-element Namespace partitions and global
attributes is confusing, but it's non-normative and you can safely
ignore it.
> A sample set of declaration for a series of elements that use the
> type attribute might look as follows:
>
> <!ELEMENT student EMPTY>
> <!ATTLIST student
> xlink:type (locator) #FIXED "locator"
> xlink:href CDATA #REQUIRED
> xlink:role NMTOKEN #FIXED "student"
> xlink:title CDATA #IMPLIED
> >
> . . . .
>
> The following example shows how an XML document using these
> declarations might look:
>
> <student
> href="/students/patjones.xml"
> title="Pat Jones" />
> . . . .
>
> Does this mean that once the namespace prefix has been declared in the
> DTD the parsers understand that (for example) "href" really means
> "xlink:href" (and therefore this sample document will be valid)?
To me, that looks very much like a typo. I would have expected
<student
xlink:href = "/students/patjones.xml"
xlink:title="Pat Jones" />
All the best,
David
--
David Megginson david@megginson.com
http://www.megginson.com/
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