# text.div
Operation

# title
Test the subsumption relationship between code/Coding A and code/Coding B given the semantics of subsumption in the underlying code system (see hierarchyMeaning).

# description
The subsumption relationship between code/Coding "A" and code/Coding "B". There are 4 possible codes to be returned (equivalent, subsumes, subsumed-by, and not-subsumed) as defined in the concept-subsumption-outcome value set. If the server is unable to determine the relationship between the codes/Codings, then it returns an error response with an OperationOutcome.

# parameter[].documentation
The "A" code that is to be tested. If a code is provided, a system must be provided

# parameter[].documentation
The "B" code that is to be tested. If a code is provided, a system must be provided

# parameter[].documentation
The code system in which subsumption testing is to be performed. This must be provided unless the operation is invoked on a code system instance

# parameter[].documentation
The version of the code system, if one was provided in the source data

# parameter[].documentation
The "A" Coding that is to be tested. The code system does not have to match the specified subsumption code system, but the relationships between the code systems must be well established

# parameter[].documentation
The "B" Coding that is to be tested. The code system does not have to match the specified subsumption code system, but the relationships between the code systems must be well established