Hi Mukul, Your schema is invalid. It violates the "Unique Particle Attribution" [1] constraint:
[Error] test.xsd:12:37: cos-nonambig: x and x (or elements from their substitution group) violate "Unique Particle Attribution". During validation against this schema, ambiguity would be created for those two particles. You need to turn on the schema full checking feature [2] with the -f option in order for this constraint to be checked. It's disabled by default. You can't write a legal schema document to achieve what you want with XML Schema 1.0 but I imagine you could with XML Schema 1.1 by using assertions [3]. Thanks. [1] http://www.w3.org/TR/xmlschema-1/#cos-nonambig [2] http://xerces.apache.org/xerces2-j/features.html#validation.schema-full-checking [3] http://www.w3.org/TR/xmlschema11-1/#cAssertions Michael Glavassevich XML Parser Development IBM Toronto Lab E-mail: [EMAIL PROTECTED] E-mail: [EMAIL PROTECTED] "Mukul Gandhi" <[EMAIL PROTECTED]> wrote on 05/23/2008 12:26:28 PM: > Hi all, > I have this sample XML document: > > <?xml version="1.0"?> > <data> > <record> > <x>foo</x> > <y>hi</y> > <z>something</z> > </record> > <record> > <x>bar</x> > <y>there</y> > <u>something else</u> > </record> > </data> > > and I have written the following XML Schema for this: > > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";> > > <xs:element name="data"> > <xs:complexType> > <xs:sequence> > <xs:element name="record" type="recordType" minOccurs="0" > maxOccurs="unbounded"/> > </xs:sequence> > </xs:complexType> > </xs:element> > > <xs:complexType name="recordType"> > <xs:choice> > <xs:sequence> > <xs:element name="x" type="xs:string" fixed="foo" /> > <xs:element name="y" type="xs:string" /> > <xs:element name="z" type="xs:string" /> > </xs:sequence> > <xs:sequence> > <xs:element name="x" type="xs:string" fixed="bar" /> > <xs:element name="y" type="xs:string" /> > <xs:element name="u" type="xs:string" /> > </xs:sequence> > </xs:choice> > </xs:complexType> > > </xs:schema> > > What I actually want is, if value of x is foo, the 3rd element in > record should be z. While if value of x is bar, the 3rd element in > record should be u. > > I thought that the sample XML shown above would be valid as per the > above Schema. But Xerces-J 2.9.1 gives the following error as a result > of validation: > > java jaxp.SourceValidator -i test.xml -a test.xsd > [Error] test.xml:9:15: cvc-elt.5.2.2.2.2: The value 'bar' of element > 'x' does no > t match the {value constraint} value 'foo'. > [Error] test.xml:11:8: cvc-complex-type.2.4.a: Invalid content was > found startin > g with element 'u'. One of '{z}' is expected. > test.xml: 70 ms > > (I am using the SourceValidator utility provided with Xerces). > > My questions are: > > The Schema seems to compile fine with Xerces. There is no Schema > grammar error flagged by Xerces. > > 1) Is it fine to use xs:choice to select one of two (or many) xs:sequence ? > > 2) Can this be a possible Xerces bug? > > 3) What will be the correct XSD 1.0 Schema for this requirement? Is > this problem solvable with XSD 1.0? If not, would XSD 1.1 bring some > features to address this issue? > > -- > Regards, > Mukul Gandhi > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED]
