public static  void main(String[] args) 
{
        // Create an instance of the sample to test.
        SubstitutionGroup sample = new SubstitutionGroup();
        // Create a schema type instance from the XML indicated by the path.
        SubstitutionGroup subGrp = new SubstitutionGroup();
        PurchaseOrderDocument poDoc = subGrp.parseXml(args[0]);
        // Validate the XML.
        assert sample.validateXml(poDoc);
        // Create a new document that adds two elements.
        PurchaseOrderDocument newDoc = sample.createDocument(poDoc, args[1]);
        // Validate the XML.
        assert sample.validateXml(newDoc);
}

Tests the SubstitutionGroup sample.