Hi there. A few points: * Not sure this list is really an appropriate place to ask questions about the W3C XML Schema Language.
* Why are you using it, anyway? (I generally advise against using any constraint language other than DSDL (i.e., RELAX NG, ISO Schematron, et al.) unless circumstances absolutely require it.) * To be honest, I don't know how to do this in XSD. But the following Schematron schema checks for uniqueness of the eye-dee= attribute. (I just couldn't bring myself to put a "/" into an attribute named "id", sorry :-) <?xml version="1.0" encoding="UTF-8"?> <schema xmlns="http://purl.oclc.org/dsdl/schematron";> <pattern> <rule context="*...@eye-dee]"> <report test="./@eye-dee = //*[generate-id(.) != generate-id(current())]/@eye-dee"> eye-dee= values must be unique </report> </rule> </pattern> </schema> > I'am trying to write a xml schema which must validate that a given > attribute is unique. > > A (valid) simple example of the problem could look like this: > <root xmlns="http://ns2"; > > <a id="a/1" /> > <a id="a/2" > > <a id="a/3" /> > <a id="a/4"/> > </a> > </root> > > An invalid example (where the ID field is not unique) could look like this: > <root xmlns="http://ns2"; > > <a id="a/1" /> > <a id="a/2" > > <a id="a/1" /> > <a id="a/4"/> > </a> > </root> > > The schema I have been experimenting with looks like this: > > <xsd:schema > xmlns:xsd="http://www.w3.org/2001/XMLSchema"; > xmlns:ptt="http://ns2"; > targetNamespace="http://ns2"; > elementFormDefault="qualified" > > > <xsd:element name="root" type="ptt:myList"> > <xsd:unique name="myId"> > <xsd:selector xpath="ptt:*"/> > <xsd:field xpath="@id"/> > </xsd:unique> > </xsd:element> > > <xsd:complexType name="myList"> > <xsd:sequence minOccurs="1"> > <xsd:element name="a" minOccurs="1" maxOccurs="unbounded" > type="ptt:asdf" /> > </xsd:sequence> > </xsd:complexType> > > <xsd:complexType name="asdf"> > <xsd:sequence minOccurs="1"> > <xsd:element name="a" minOccurs="0" maxOccurs="unbounded" > type="ptt:asdf" /> > </xsd:sequence> > <xsd:attribute name="id" type="xsd:string"/> > </xsd:complexType> > </xsd:schema> > > I belive my problem is, that I can not figure out the correct xpath > to write in the selector. _______________________________________________ xml mailing list, project page http://xmlsoft.org/ [email protected] http://mail.gnome.org/mailman/listinfo/xml
