Defines the level of expectation associated with a given system capability.

If set to true, indicates that support for the specified behavior would make a system non-conformant with the specification.

A code system that is supported by the system that is not defined in a value set resource.

This extension defines a possible search parameter combination, by listing a set of search parameters and indicating whether they are required or optional. If a search combination is specified, clients should expect that they must submit a search that meets one of the required combinations or the search will be unsuccessful. If multiple search parameter combinations are specified, a client may pick between them, and supply the minimal required parameters for any of the combinations.

Where the server provides its web socket end-point.