===== Standardized Meta-Data =====
**THIS IS OUTDATED. All documentation is now on the [[https://github.com/OHDSI/CommonDataModel/wiki|github wiki]]. Please refer there or to the [[projects:workgroups:cdm-wg|CDM working group]] for more information**

Metadata about the data should be derived from the data themselves during ETL. However, the following contains a few key pieces of information that are convenient especially for software applications utilizing the CDM data.

Below provides an entity-relationship diagram highlighting the tables within the Standardized Metadata portion of the OMOP Common Data Model: 

{{:documentation:cdm:standard_meta_data.png|
Standardized Meta-Data Entity-Relationship diagram}}