Operation-valueset-expand

A canonical url for a value set. The server must know the value set (e.g. it is defined explicitly in the server's value sets, or it is defined implicitly by some code system known to the server

The value set is provided directly as part of the request. Servers may choose not to accept value sets in this fashion

The identifier that is used to identify a specific version of the value set to be used when generating the expansion. This is an arbitrary value managed by the value set author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available.

The context of the value set, so that the server can resolve this to a value set to expand. The recommended format for this URI is [Structure Definition URL]#[name or path into structure definition] e.g. http://hl7.org/fhir/StructureDefinition/observation-hspc-height-hspcheight#Observation.interpretation. Other forms may be used but are not defined. This form is only usable if the terminology server also has access to the profile conformance registry that the server is using, but can be used to delegate the mapping from an application context to a binding at run-time

A text filter that is applied to restrict the codes that are returned (this If a context is useful in provided, a UI context). context direction may also be provided. Valid values are 'incoming' and 'outgoing'. The interpretation of this purpose is delegated to inform the server in order to allow whether to determine use the most optimal search approach for value set associated with the context for reading or writing purposes (note: for most elements, this is the same value set, but there are a few elements where the reading and writing value sets are different)

A reference to an external definition text filter that provides additional control information about how is applied to restrict the expansion codes that are returned (this is performed. At useful in a UI context). The interpretation of this time, there is no agreed format or functionality delegated to the server in order to allow to determine the most optimal search approach for the target of this URI. context. The VSAC Documentation provides one example of server can document the use way this parameter works in TerminologyCapabilities ..expansion.textFilter. Typical usage of this parameter. Implementers parameter includes functionality like:

• using this element will need to agree left matching e.g. "acut ast"
• allowing for wild cards such as %, &, ?
• searching on an appropriate mechanism definition as well as display(s)
• allowing for use within search conditions (and / or / exclusions)

Text Search engines such as Lucene or Solr, long with their interoperability community. Known uses considerable functionality, might also be used. The optional text search might also be code system specific, and servers might have different implementations for profile include: * whether to return the value set content logical definition with the expansion * whether to include inactive concepts different code systems

The date for which the expansion should be generated. if a date is provided, it means that the server should use the value set / code system definitions as they were on the given date, or return an error if this is not possible. Normally, the date is the current conditions (which is the default value) but under some circumstances, systems need to generate an expansion as it would have been in the past. A typical example of this would be where code selection is constrained to the set of codes that were available when the patient was treated, not when the record is being edited. Note that which date is appropriate is a matter for implementation policy.

Paging support - where to start if a subset is desired (default = 0). Offset is number of records (not number of pages)

Paging support - how many codes should be provided in a partial page view. Paging only applies to flat expansions - servers ignore paging if the expansion is not flat. If count = 0, the client is asking how large the expansion is. Servers SHOULD honor this request for hierarchical expansions as well, and simply return the overall count

Controls whether concept designations are to be included or excluded in value set expansions. Overrides the value expansions

A token that specifies a system+code that is either a use or a language. Designations that match by language or use are included in the expansion profile if there expansion. If no designation is one specified, it is at the server discretion which designations to return

Controls whether the value set definition is included or excluded in value set expansions. Overrides the value in the expansion profile if there is one expansions

Controls whether inactive concepts are included or excluded in value set expansions. Overrides the value in the expansion profile if there is one. Note that if the value set explicitly specifies that inactive codes are included, this parameter can still remove them from a specific expansion, but this parameter cannot include them if the value set excludes them

Controls whether or not the value set expansion nests codes or not (i.e. ValueSet.expansion.contains.contains). Overrides the value in the expansion profile if there is one ValueSet.expansion.contains.contains)

Controls whether or not the value set expansion includes is assembled for a user interface use or not. Value sets intended for User Interface might include 'abstract' codes which cannot be displayed in or have nested contains with items with no code or abstract = true, with the sole purpose of helping a user interfaces. Overrides navigate through the list efficiently, where as a value set not generated for UI use might be flat, and only contain the selectable codes in the expansion profile if there is one value set. The exact implications of 'for UI' depend on the code system, and what properties it exposes for a terminology server to use. In the FHIR Specification itself, the value set expansions are generated with excludeNotForUI = false, and the expansions used when generated schema / code etc, or performing validation, are all excludeNotForUI = true.

Controls whether or not the value set expansion includes post coordinated codes. Overrides the value in the expansion profile if there is one codes

Specifies the language to be used for description in the expansions i.e. the language to be used for ValueSet.expansion.contains.display. Overrides ValueSet.expansion.contains.display

Code system, or a particular version of a code system to be excluded from the value in set expansion. The format is the expansion profile same as a canonical URL: [system]|[version] - e.g. http://loinc.org|2.56

Specifies a version to use for a system, if there is the value set does not specify which one to use. The format is the same as a canonical URL: [system]|[version] - e.g. http://loinc.org|2.56

Edge Case: Specifies a version to use for a system. If the a value set being expanded specifies a different version, an error is incomplete (because it returned instead of the expansion. The format is too big the same as a canonical URL: [system]|[version] - e.g. http://loinc.org|2.56

Edge Case: Specifies a version to expand), return use for a limited expansion (a subset) with an indicator system. This parameter overrides any specified version in the value set (and any it depends on). The format is the same as a canonical URL: [system]|[version] - e.g. http://loinc.org|2.56. Note that this has obvious safety issues, in that it may result in a value set expansion giving a different list of codes that is incomplete. Overrides both wrong and unsafe, and implementers should only use this capability reluctantly. It primarily exists to deal with situations where specifications have fallen into decay as time passes. If the value is override, the version used SHALL explicitly be represented in the expansion profile if there is one parameters

The result of the expansion. Servers generating expansions SHOULD ensure that all the parameters that affect the contents of the expansion are recorded in the ValueSet.expansion.parameter list