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Re: IRIs - Question

• From: "bryan rasmussen" <rasmussen.bryan@g...>
• To: "Michael Kay" <mike@s...>
• Date: Thu, 24 Apr 2008 11:38:16 +0200

I guess though the error there would be at a lower level, a namespace
error, as opposed to an XML Schema error that the targetNamespace is
not a correct targetNamespace, as a targetNamespace in XML Schema,
IIRC, is an anyURI ?

Cheers,
Bryan Rasmussen


On Thu, Apr 24, 2008 at 11:30 AM, Michael Kay <mike@s...> wrote:
> The XML Namespaces 1.0 specification says (section 2.1)
>
>  "An XML namespace is identified by a URI reference [RFC3986]"
>
>  Which would make your namespace name incorrect. However, there is no rule in
>  the spec that says your document is not namespace-well-formed; and this is
>  not an accidental omission, there has been intensive debate on the subject.
>  I argued quite strongly that the spec should either make it mandatory for a
>  namespace name to be a valid URI, or should explicitly make it legal to use
>  any old character string that you fancy; but the WG in its wisdom, or more
>  likely in its lack of consensus, failed to take either of those options.
>
>  The vast majority of XML products do in fact allow you to use any old
>  character string that you fancy. An exception is XOM, which takes a rather
>  purist view (one which in my opinion is not justified by the
>  specifications), and will probably reject your use of
>  http://großerJob.german.com
>
>  XML Namespaces 1.1 allows the namespace name to be an IRI, which allows your
>  choice, but again it pointedly refuses to say that the document is
>  ill-formed if the name is not a valid IRI.
>
>  Pragmatically, (a) the specs refuse to make a clear unambiguous statement on
>  this issue, (b) your chosen namespace will work with nearly every popular
>  XML product, the only exception I know of being XOM, but (c) you could be
>  inviting unnecessary trouble due to character encoding issues.
>
>  Outside the scope of namespaces, support for non-ASCII characters in URIs on
>  the web (that is, support for IRIs) seems very patchy. I did some
>  experiments for example creating HTML pages that link to the site
>  http://www.münchen.de/ (which redirects to www.muenchen.de), with and
>  without percent-encoding of the URI references, and the results were not
>  encouraging.
>
>  Michael Kay
>  http://www.saxonica.com/
>
>
>
>  > -----Original Message-----
>  > From: Ramkumar Menon [mailto:ramkumar.menon@g...]
>  > Sent: 23 April 2008 20:48
>  > To: xml-dev@l...; xsl-list@l...
>  > Subject:  IRIs - Question
>  >
>  > I have a WSDL/XSD file whose targetNamespace is
>  > http://großerJob.german.com. The namespace URI contains
>  > characters from german language, as you can see.
>  > If use a designer tool to view and validate this WSDL/XML,
>  > what should be the behaviour?
>  > a) Give an error stating that the targetNamespace is not in
>  > an anyURI format?
>  > b) Proceed to percent encode it and then validate the URI.[as
>  > per UTF-8 maybe]
>  >
>  > The confusion here is that the WSDL/Schema
>  > viewing/interpreting in the tool by a human would be
>  > difficult if I use all percent encodings in the URIs.
>  > Shouldn't the tools detect the character set and
>  > appropriately encode it. For instance, if I take a print out
>  > of the document, I would prefer to view the native language,
>  > as opposed to the encoded URIs.
>  > Humans should be able to read the URI in the viewer in the
>  > native language as-is, whereas any tools that intend to
>  > process it should treat it as a set of octets, and handle
>  > them accordingly.
>  >
>  > So the  Q is : Should a designer tool emit errors when it
>  > validates the document with the above behaviour?
>  > Please advise.
>  >
>  > Ram
>  >
>  >
>  >
>  > --
>  > Shift to the left, shift to the right!
>  > Pop up, push down, byte, byte, byte!
>  >
>  > -Ramkumar Menon
>  >  A typical Macroprocessor
>  >
>
>
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• References:
  • IRIs - Question
    • From: "Ramkumar Menon" <ramkumar.menon@g...>
  • RE: IRIs - Question
    • From: "Michael Kay" <mike@s...>