C.2 Query/Retrieve Information Model Definition
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## C.2 Query/Retrieve Information Model Definition

The Query/Retrieve Information Model is identified by the SOP Class negotiated at Association establishment time. The SOP Class is composed of both an Information Model and a DIMSE-C Service Group.

### Note

This SOP Class identifies the class of the Query/Retrieve Information Model (i.e., not the SOP Class of the stored SOP Instances for which the SCP has information).

Information Model Definitions for standard SOP Classes of the Query/Retrieve Service Class are defined in this Annex. A Query/Retrieve Information Model Definition contains:

- Entity-Relationship Model Definition

- Key Attributes Definition

### C.2.1 Entity-Relationship Model Definition

For any Query/Retrieve Information Model, an Entity-Relationship Model defines a hierarchy of entities, with Attributes defined for each level in the hierarchy (e.g., Patient, Study, Series, Composite Object Instance).

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