SQL & PL/SQL

hi all,
I want to migrate from 11g to 10g so I found that the best solution is to get the XML from the 11g and import it to the 10g.

My first question: I know the how to get a table:

SELECT DBMS_METADATA.GET_XML
('TABLE', 'EMPLOYEES', 'HR')
FROM dual;

I want to know how to get the schema including tables, views program units ...


My second question:
After exporting the XML how to import it into another schema

thanks.