code: public Verifier newVerifier(String uri)
  		throws VerifierConfigurationException, SAXException, IOException {
  		
  		return compileSchema(uri).newVerifier();
  	}
docs: parses a schema at the specified location and returns a Verifier object
  that validates documents by using that schema.
  
  <p>
  Some of XML parsers accepts filenames as well as URLs, while others
  reject them. Therefore, to parse a file as a schema, you should use
  a File object.
  
  @param uri URI of a schema file