XML Validation - Using multiple xsd's

Question

I have two xsd files to validate a xml. But the problem is my code takes only one xsd. How to use other xsd in the following code? I dont have idea about where should i place/call 2nd xsd file.

             private void validate(File xmlF,File xsd1,File xsd2) {
                    try {
                        url = new URL(xsd.toURI().toString());//  xsd1
                    } catch (MalformedURLException e) {
                        e.printStackTrace();
                    }


                    source = new StreamSource(xml); // xml
                    try {
                        System.out.println(url);
                        schema = schemaFactory.newSchema(url);
                    } catch (SAXException e) {
                        e.printStackTrace();
                    }
                    validator = schema.newValidator();
                    System.out.println(xml);
                    try {
                        validator.validate(source);
                    } catch (SAXException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

Answer 1

Plenty of hits when searching on SO or Google. One of them is this question, where the author found his own solution and reports the following code to add multiple xsd's to the validator:

Schema schema = factory().newSchema(new Source[] {
  new StreamSource(stream("foo.xsd")),
  new StreamSource(stream("Alpha.xsd")),
  new StreamSource(stream("Mercury.xsd")),
});

However, when working directly with InputStream on StreamSource, the resolver is not able to load any referenced XSD files. If, for instance, the file xsd1 imports or includes a third file (which is not xsd2), schema creation will fail. You should either set the system identifier (setSystemId) or (even better) use the StreamSource(File f) constructor.

Adjusted to your example code:

try {
  schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
  schema = schemaFactory.newSchema(new Source[] {
    new StreamSource(xsd1), new StreamSource(xsd2)
  });
} catch (SAXException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
}

Note:

If working with classpath resources, I'd prefer the StreamSource(String systemId) constructor (rather than creating a File):

new StreamSource(getClass().getClassLoader().getResource("a.xsd").toExternalForm());