Re: [xml-dev] A XSD regex to allow a QName in Clark form

[cmarchand@oxiane.com]

As I use this value to create a new net.sf.saxon.s9api.QName, via 
constructor and factory methods, I'm gonna check this.
Thanks a lot for this precises explanations.

Best regards,
Christophe



Le 2017-09-14 11:04, Michael Kay a écrit :
> 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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