Does anyone know how to validate whether a schema is a valid schema Without creating an instance document and then validating that first?
I have code which uses a SAX parser and works when validating an xml instance document against its schema however Im trying to use this same code to pass in a schema and the Schema reference and validate one against the other. e.g.
validate(myXMLDoc, "/home/mySchema.xsd") -- works valiadte(mySchema, "/home/XMLSchema.xsd") -- fails
Does anyone know if this approach is valid or even if Xerces 2.0.1 Supports validating a schema directly in this way?
The code Im using is listed below. Im getting the following error when I run it...
"schema_reference.4: Failed to read schema document 'null', because
1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema."
...even though the document does exist on the file system, can be
read by my application and does have the root element <xsd:schema> for both schemas.
Any help anyone can give would be much appreciated. Cheers
-----------
private static String validationFeat = "http://xml.org/sax/features/validation";;
private static String schemaValidationFeat = "http://apache.org/xml/features/validation/schema";;
private static String extSchemaProp = "http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation";;
private boolean validate(InputSource xmlSource, String schemaURL) {valid = true;
try {
SAXParser parser = new SAXParser(); // configures the xerces parser for schema validation.
parser.setFeature(validationFeat, true);
parser.setFeature(schemaValidationFeat, true); //validate against the given schemaURL
parser.setProperty(extSchemaProp, schemaURL); // binds custom error handler to parser
ErrorHandler handler = new ValidatingHandler();
parser.setErrorHandler (handler); // parse (validates) the xml
parser.parse(xmlSource);} catch (SAXNotRecognizedException snre) {
System.out.println("SAX not recognised " + snre);
valid = false;
} catch (SAXException se) {
System.out.println("SAX parser " + se);
valid = false;
} catch (Exception e) {
System.out.println("error parsing " + e);
valid = false;
}return valid; }
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