# text.div
Operation

# title
Validate that a coded value is in the code system.

# description
Validate that a coded value is in the code system. If the operation is not called at the instance level, one of the parameters "url" or "codeSystem" must be provided. The operation returns a result (true / false), an error message, and the recommended display for the code.

When invoking this operation, a client SHALL provide one (and only one) of the parameters (code+system, coding, or codeableConcept). Other parameters (including version and display) are optional.

# parameter[].documentation
The display associated with the code, if provided. If a display is provided a code must be provided. If no display is provided, the server cannot validate the display value, but may choose to return a recommended display name in an extension in the outcome. Whether displays are case sensitive is code system dependent

# parameter[].documentation
A coding to validate. The system must match the specified code system

# parameter[].documentation
A full codeableConcept to validate. The server returns true if one of the coding values is in the code system, and may also validate that the codings are not in conflict with each other if more than one is present

# parameter[].documentation
An openEHR DV_CODED_TEXT to validate. The system must match the specified code system

# parameter[].documentation
Specifies the language to be used for description when validating the display property

# parameter[].documentation
CodeSystem URL. The server must know the code system (e.g. it is defined explicitly in the server's code systems, or it is known implicitly by the server