They are a bit more than 100 intra-ETLs in OCDM, to feed the analytical layers, including pre-built mining and OLAP cubes.
There are about 20 000 attributes for 1400+ tables.
The exact details of attributes (with description) for each OCDM table is only available to paying customers.
Sorry but no, unless you have access through a customer who bought OCDM (= paying customer), who gives you access to it (as implementers).
The only (free) alternative is having a specific "OCDM Development NDA" in place with OCDM Product Mngt (please contact Tony Velcich: Tony.Velcich@oracle.com).
If you plan to develop ETLs or further analytics on OCDM, this is what i would recommend.
I hope this helps.