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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Revised namespaces draft available
At 14:52 04/08/98 -0400, John Cowan wrote:
>Peter Murray-Rust wrote:
>
>> - collate experience from those who have actually implemented
namespaces
>> (somewhere in the 1997..1998-05 period). For example I discovered while
>> browsing XML4J today that it has considerable namespace support, and I'm
>> sure there are other tools (I'm happy to make the latest JUMBO2 available
>> shortly - it has a simple namespace approach).
>
>Well, as author of NamespaceFilter (which now bites the dust), I suppose
Lots of things bite the dust - chunks of JUMBO2 have as well and I suspect
XML4J.
>I count as a namespace implementor. I foresee no difficulties in
>rewriting my code to meet the new draft (and at the same time adding
>general support for inherited attributes, which I had wanted to do
>as a ParserFilter anyway). The new version will be less efficient,
>since every startElement event will have to have its attributes
>searched to see if a new xmlns:* attribute appears.
Since namespaces are so fundamental I think it's very important that we
outline the various ways forward. AIUI your filter sits on top of SAX
whereas I suspect others (including at least myself privately) want SAX to
do as much as possible. We don't want these to be incompatible.
>
>I would point out that people who use default or FIXED values of
>xmlns:* attributes would be well advised to put them in the
>internal subset, since non-validating parsers may not see them
>otherwise.
This isn't much fun. It would be a very easy mistake to make. Can we
package the NS stuff in a single file and do something like:
<!DOCTYPE ABC SYSTEM "abc.dtd" [
<!ENTITY % namespace1 SYSTEM "namespace1.ent">
%namespace1;
<!ENTITY % namespace2 SYSTEM "namespace2.ent">
%namespace2;
]>
This makes sure it gets included. You can also include namespace1.ent in
the external subset - it will get ignored if already declared in the
internal subset.
>
>
>> - IBTWSH
>
>IBTWSH is non-namespace rather than single-namespace.
My point was that if I use it in (say) VHG - as I intend to - it has to
acquire a namespace. Thus:
<VHG:termEntry xmlns:VHG="urn:vhg.co.uk:schema"> <!-- please tell me if
this is wrong -->
<VHG:term xml:lang="en" xmlns:xml="http://w3.org">XYZZY</VHG:term>
<VHG:definition>
<IB:P xmlns:IB="http://john.cowan.some.where">A magic word</IB:P>
</VHG:definition>
</VHG:termEntry>
unless you intend that it should always have the null namespace xmlns="". I
wouldn't think that a good idea.
P.
>
>--
>John Cowan http://www.ccil.org/~cowan cowan@c...
> You tollerday donsk? N. You tolkatiff scowegian? Nn.
> You spigotty anglease? Nnn. You phonio saxo? Nnnn.
> Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5)
>
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>
Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic
net connection
VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary
http://www.venus.co.uk/vhg
xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i...
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