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Re: A XSD regex to allow a QName in Clark form

• From: cmarchand@oxiane.com
• To: Michael Kay <mike@saxonica.com>
• Date: Thu, 14 Sep 2017 11:17:38 +0200

Some more precise terminology might help.

Clark notation is described here:

http://www.jclark.com/xml/xmlns.htm

and uses the notation "{uri}local" for a name that is in a namespace.
That page doesn't define a corresponding notation for a name in no
namespace, but it would be wise to accept either "local" or "{}local"
unless specified otherwise. The JAXP API (for example
Transformer.setParameter) uses Clark notation (without naming it) and
says that "local" should be used for a no-namespace name: it does not
allow "{}local".

XPath 3.0 introduces a similar syntax. An EQName is either a (lexical)
QName (format: (prefix:)?local ), or a URIQualifiedName, format

"Q" "{" [^{}]* "}" NCName

which is equivalent to the regex

Q\{[^{}]*\}\i\c*

This format explicitly allows a no-namespace name to be written as
Q{}local.

Michael Kay
Saxonica

On 14 Sep 2017, at 08:56, yamahito <yamahito@gmail.com> wrote:
Try
<xs:pattern value="Q?\{[^\}]+\}[^:\{\}]+"/>
?

On Thu, 14 Sep 2017 at 7:55 am, <cmarchand@oxiane.com> wrote:

Hi !

I'm not a regex killer, especially when regex flavour is not the
one I
use on my linux box...

In a schema, I need a simple type that allows a QName, written
either
"prefix:localName" or in ClarkeForm "Q{nsUri}localName", or in
the-last-one-I-cant-remember-the-name "{nsUri}localName"

I've started with the one available in XSD schema :

<xs:simpleType name="QName">
<xs:annotation>
<xs:documentation> A QName. This schema does not use the
built-in
type xs:QName, but rather defines its own QName type. Although
xs:QName
would define the correct validation on these attributes, a schema
processor would expand unprefixed QNames incorrectly when
constructing
the PSVI, because (as defined in XML Schema errata) an unprefixed
xs:QName is assumed to be in the default namespace, which is not
the
correct assumption for XSLT. The data type is defined as a
restriction
of the built-in type Name, restricted so that it can only contain
one
colon which must not be the first or last character. TODO: change
implementation to allow use ClarkeForm </xs:documentation>
</xs:annotation>
<xs:restriction base="xs:Name">
<xs:pattern value="([^:]+:)?[^:]+"/>
</xs:restriction>
</xs:simpleType>

But my pattern for ClarkeForm isn't correct :
<xs:pattern value="Q?\{[^\{]+\}[^:\{\}]+"/>

Any help will be appreciated.
Thanks in advance,
Christophe

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• References:
  • A XSD regex to allow a QName in Clark form
    • From: cmarchand@oxiane.com
  • Re: A XSD regex to allow a QName in Clark form
    • From: yamahito <yamahito@gmail.com>
  • Re: A XSD regex to allow a QName in Clark form
    • From: Michael Kay <mike@saxonica.com>