Uniform access to entities in registered data store services

A data store catalogue service model is disclosed for exposing disparate data store services to clients without requiring explicit knowledge on how to interact with each disparate service. The data store catalogue service model may maintain interaction details for each data store service that clients may access for interacting with those services. The model may also maintain metadata that may describe the different types of services available for access by clients, the data types used by those services, how to access the data provided by the services, and how to communicate semantically with the services for accessing the service's data. Additionally, the data store may include metadata that enables clients to interact with one or more registered data stores in a number of ways, such as for discovering registered data store services, entities, classes, and/or any associations between related entities within the same or among disparate services.