JDR UTILITY in OAF

In Oracle OA Framework, is the MDS page/document definition stored in database or in the file system?

The MDS document details are loaded into database, in the following sets of tables.
JDR_ATTRIBUTES
JDR_ATTRIBUTES_TRANS
JDR_COMPONENTS
JDR_PATHS
The Document is loaded via XMLImporter.

and Through the JDR API you can get all this information from the database with the help of these statement..

jdr_utils.listdocuments('/oracle/apps/cs/', TRUE);
jdr_utils.listdocuments('/oracle/apps/cs/pagging//server/',TRUE);
jdr_utils.listcustomizations(p_document => '/oracle/apps/cs/pagging/webui/CustomPaggingPG');
jdr_utils.printdocument(p_document => '/oracle/apps/cs/pagging/server/CustomPageAM');
jdr_utils.printdocument(p_document => '/oracle/apps/cs/pagging/webui/CustomMailPG');
jdr_utils.deletedocument(p_document => '/oracle/apps/cs/pagging/server/CustomPageAM');