Metacat

Add the code to throw an exception to tell users that the namespace or format id was not registered in Metacat.

Add the methods to figure out the schema location base on namespace, format id or no-namespace-schema-location uri.

Add a new constant for no-namespace schemas.

Add a method to get the type.

Add a method to get the type of the schema.

Add a new class represent a schema without a namespace.

Add a SAX parser to determine the namespace of a xml object. It only parses the root element, then stops.

Disable the feature of downloading external schemas.

Change the log information a little bit.

use the new rules to validate an xml object base on dtds.