What is the best way to validate XML w.r.t XSD using Free XML Validator?

Question

I need to validate XML against XSD and so what are free XML Validator available out there that could be useful for my task.

Thanks.

Answer 1

xerces has Java, C++, and Perl versions.

The perl version contains a command line validator for convenience.

The Java version API includes classes and example code for validation

Example code:

// parse an XML document into a DOM tree
DocumentBuilderFactory parserFactory = DocumentBuilderFactory.newInstance();
parserFactory.setNamespaceAware(true);
DocumentBuilder parser = parserFactory.newDocumentBuilder();
Document document = parser.parse(new File("instance.xml"));

// create a SchemaFactory capable of understanding WXS schemas
SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);

// load a WXS schema, represented by a Schema instance
Source schemaFile = new StreamSource(new File("mySchema.xsd"));
Schema schema = factory.newSchema(schemaFile);

// create a Validator instance, which can be used to validate an instance document
Validator validator = schema.newValidator();

// validate the DOM tree
try {
    validator.validate(new DOMSource(document));
} catch (SAXException e) {
    // instance document is invalid!
}