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A XSD regex to allow a QName in Clark form

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: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:restriction base="xs:Name">
<xs:pattern value="([^:]+:)?[^:]+"/>

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

Any help will be appreciated.
Thanks in advance,

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