An Entity Data Model, EDM, maps the available entities in a domain. Each entity is further defined by its structural and navigation properties. Structural properties have values, and navigation properties are references to other entities in the domain.

An EDM is defined in Common Schema Definition Language, CSDL, as an XML representation. You can access an EDM by adding $metadata at the end of the domain root URL. For example, you can access the EDM of the Project Management domain at:

Clients can send an HTTP GET request to this URL to get the EDM of the Project Management domain. The EDM enables clients to get more information about the entities, relationships, functions, and actions provided by that domain.