An Identifier in a C-FIND request shall contain:
Key Attributes with values to be matched against the values of Attributes specified in the SOP Class.
Content Template Sequence (0040,A504), which shall include a single sequence item containing the Template Identifier (0040,DB00) and Mapping Resource (0008,0105) attributes, to identify the template structure to use in the matching C-FIND responses.
Conditionally, the Attribute Specific Character Set (0008,0005). This Attribute shall be included if expanded or replacement character sets may be used in any of the Attributes in the Request Identifier. It shall not be included otherwise.
The Key Attributes and values allowable for the query are defined in the SOP Class definition for the Relevant Patient Information Model.