W3C Schema Validation does not cater for xs:unique constraints

Consider the following XSD (called idc2.xsd):

```

```

And the corresponding (invalid) XML (called idc2.xml):

```

1
1
2

```
The following pom.xml dependencies I used:

```

com.fasterxml.woodstox
woodstox-core
5.0.3

msv
msv
20050913

relaxngDatatype
relaxngDatatype
20020414

com.sun.msv.datatype.xsd
xsdlib
2013.2

```

And the following example program (TestXSD.java):

```
package jdi.test.xsdvalidation;

import java.io.InputStream;

import javax.xml.stream.XMLInputFactory;

import org.codehaus.stax2.XMLInputFactory2;
import org.codehaus.stax2.XMLStreamReader2;
import org.codehaus.stax2.validation.XMLValidationException;
import org.codehaus.stax2.validation.XMLValidationSchema;
import org.codehaus.stax2.validation.XMLValidationSchemaFactory;

public class TestXSD {

public static void main(final String[] args) throws Exception {
final String xmlFileName = "idc2.xml";
final String xsdFileName = "idc2.xsd";

//load Schema
final XMLValidationSchemaFactory xmlValidationSchemaFactory = XMLValidationSchemaFactory.newInstance(XMLValidationSchema.SCHEMA_ID_W3C_SCHEMA);

final InputStream schemaInputStream = TestXSD.class.getResourceAsStream(xsdFileName);
final XMLValidationSchema xmlValidationSchema = xmlValidationSchemaFactory.createSchema(schemaInputStream);

//load (invalid) XML file
final InputStream xmlInputStream = TestXSD.class.getResourceAsStream(xmlFileName);
final XMLInputFactory2 xmlInputFactory2 = (XMLInputFactory2)XMLInputFactory.newInstance();
final XMLStreamReader2 xmlStreamReader =(XMLStreamReader2) xmlInputFactory2.createXMLStreamReader(xmlInputStream);
try{
//validate the XML file
xmlStreamReader.validateAgainst(xmlValidationSchema);
//traverse the streaming document
while(xmlStreamReader.hasNext()){
xmlStreamReader.next();
}
} catch(final XMLValidationException e){
//catch validation exception
System.err.println("XML file: " + xmlFileName + " failed to validatate against: " + relaxNgFileName);
return ;
}
System.out.println("XML file: " + xmlFileName + " successfully validated against: " + relaxNgFileName);
}

}

```
produces the not expected output:

XML file: idc2.xml successfully validated against: idc2.xsd

Note:

- Xerces-J 2.11 and Eclipse validate this file correctly.

Apparently I suspect that the class GenericMsvValidator is not doing any of Unique, Key, KeyRef validations. Only ID and IDREF seems to be supported (not sure whether this coincides with Key / KeyRef respectively). I have not found out whether this is supposed to be the case or just an issue. I furthermore discovered the field mVGM.grammer.topLevel.element.identityConstraints did contain the unique constraint.
The obvious suggestion to use Xerces-J instead does not solve my problem either, as https://issues.apache.org/jira/browse/XERCESJ-1276 is doing unique constraint validation in O(n^2) instead of O(n log(n)) as expected.