FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.2.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

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Extension: Is Selective

Official URL: http://hl7.org/fhir/StructureDefinition/cqf-isSelective				Version: 5.2.0-ballot
Standards status: Trial-use		Maturity Level: 3	Responsible: HL7 International / Clinical Decision Support	Computable Name: IsSelective
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1668

Allows a given data requirement to be identified as “selective”, meaning that it can be used as an additive criteria to filter a population. A selective data requirement is guaranteed to define a subset (not necessarily proper) of the initial population of an artifact. If multiple data requirements are marked selective, they all apply (i.e. AND semantics).

This extension is useful for helping implementing systems determine which data requirements are expected to be most selective of the target population. A common use case is to identify a subset of the data requirements for an artifact as “selective”, meaning that they can be used as an initial filter to establish the overall set of data. For example, the selective requirements can be used to construct an initial query or queries for data, with the non-selective requirements used for subsequent filtering on the resulting data. Although this extension may be used by artifact authors as a way to indicate expected selectivity of a data requirement, it will more typically be used by implementers and downstream packaging repositories to indicate selectivity of a data requirement given known data heuristics in particular datasets.

Context of Use

This extension may be used on the following element(s):

• Element ID DataRequirement

Usage info

Usage:

• This Extension is not used by any profiles in this Implementation Guide

Formal Views of Extension Content

Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

 

Other representations of profile: CSV, Excel, Schematron

Constraints

Id	Grade	Path(s)	Details	Requirements
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()

Search Parameters for this Extension

(none found)