The schema command
Loads an XSD schema from the specified location.
The filename is handled in the same way as the load command.
The schema definitions are available for use in validate commands issued subsequently in the session. The command is additive; the schema components are added to the collection of schema components that are already loaded, which means an error will be reported if the definitions conflict. It is not possible to unload schema definitions once loaded, except by closing the session and starting a new one.