RE: Restricting attribute content to not include a specific string

Well, this is certainly possible in XSD!

I like the following encoding most because "unknown" appears magically
in the diagonal :-) Of course, life would be much easier if we were
provided with complement or set difference operations more directly. 

Ralf

    <xs:simpleType>
      <xs:restriction base="xs:string">
        <xs:pattern value="([^u].*)?"/>
        <xs:pattern value="u([^n].*)?"/>
        <xs:pattern value="un([^k].*)?"/>
        <xs:pattern value="unk([^n].*)?"/>
        <xs:pattern value="unkn([^o].*)?"/>
        <xs:pattern value="unkno([^w].*)?"/>
        <xs:pattern value="unknow([^n].*)?"/>
        <xs:pattern value="unknown.+"/>
      </xs:restriction>
    </xs:simpleType>



> -----Original Message-----
> From: xmlschema-dev-request@w3.org
[mailto:xmlschema-dev-request@w3.org]
> On Behalf Of Michael Kay
> Sent: Thursday, April 20, 2006 1:17 AM
> To: 'Huditsch, Roman (LNG-VIE)'; xmlschema-dev@w3.org
> Subject: RE: Restricting attribute content to not include a specific
> string
> 
> 
> The ^ character can only be used in a context where a single character
is
> being matched, for example [^0-9] matches any character that isn't an
> ASCII
> digit.
> 
> I'm willing to be corrected, but I think that this can't be done.
> 
> Michael Kay
> http://www.saxonica.com/
> 
> > -----Original Message-----
> > From: xmlschema-dev-request@w3.org
> > [mailto:xmlschema-dev-request@w3.org] On Behalf Of Huditsch,
> > Roman (LNG-VIE)
> > Sent: 20 April 2006 07:59
> > To: xmlschema-dev@w3.org
> > Subject: Restricting attribute content to not include a
> > specific string
> >
> >
> > Hi,
> >
> > I need to restrict attribute values in my Schema to not be
> > the string "unknown".
> > So I declared a simple type as follows:
> >
> > 	<xs:simpleType name="attrValue">
> > 		<xs:restriction base="xs:string">
> > 			<xs:pattern value="^(unknown)"/>
> > 		</xs:restriction>
> > 	</xs:simpleType>
> >
> > Since I am not experienced with regular expressions I am kind
> > of stuck on the pattern value.
> > Do you have any idea, how to make that restriction in the
> > most simple way?
> > Thank you very much for your help.
> >
> > best regards,
> > Roman
> >
> >
>