Using CQL With FHIR
2.0.0 - STU 2
Using CQL With FHIR
2.0.0 - STU 2
This page is part of the Using CQL with FHIR Implementation Guide (v2.0.0: STU2) based on FHIR (HL7® FHIR® Standard) R4. This is the current published version in its permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions
| Page standards status: Trial-use | Maturity Level: 4 |
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<div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: OperationDefinition cql-library-evaluate</b></p><a name="cql-library-evaluate"> </a><a name="hccql-library-evaluate"> </a><p>URL: [base]/Library/$evaluate</p><p>URL: [base]/Library/[id]/$evaluate</p><h3>Parameters</h3><table class="grid"><tr><td><b>Use</b></td><td><b>Name</b></td><td><b>Scope</b></td><td><b>Cardinality</b></td><td><b>Type</b></td><td><b>Binding</b></td><td><b>Documentation</b></td></tr><tr><td>IN</td><td>url</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/datatypes.html#canonical">canonical</a></td><td/><td><div><p>The canonical url (with optional version) of the library to be evaluated. This parameter is only used when the operation is invoked at the type level, and is exclusive with the library parameter.</p>
</div></td></tr><tr><td>IN</td><td>library</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/library.html">Library</a></td><td/><td><div><p>The library to be evaluated, provided as an input. This parameter is only used when the operation is invoked at the type level, and is exclusive with the url parameter.</p>
</div></td></tr><tr><td>IN</td><td>subject</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/datatypes.html#string">string</a><br/>(<a href="https://hl7.org/fhir/R4/search.html#reference">reference</a>)</td><td/><td><div><p>Subject for which the library will be evaluated. This corresponds to the context in which the library will be evaluated and is represented as a relative FHIR id (e.g. Patient/123), which establishes both the context and context value for the evaluation</p>
</div></td></tr><tr><td>IN</td><td>expression</td><td/><td>0..*</td><td><a href="http://hl7.org/fhir/R4/datatypes.html#string">string</a></td><td/><td><div><p>The identifier (optionally qualified) of the expression(s) to be evaluated, regardless of whether the declaration is private. If no expression names are provided, the operation evaluates all public expression definitions in the library (or all expressions if includePrivate is true). If an expression name is unqualified, it refers to the name of an expression defined in the library being evaluated. If the expression name is qualified, the name refers to an the identifier of an expression defined in the library with the qualifier name, and the qualifier name must be the name of a library included by the library being evaluated (or an included library, recursively). Note that this may result in expression results being included multiple times, as expressions in included libraries may be invoked multiple times from the library being evaluated.</p>
</div></td></tr><tr><td>IN</td><td>includePrivate</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/datatypes.html#boolean">boolean</a></td><td/><td><div><p>Indicates whether to include private expression declarations in the result. Note that if expressions are named, this parameter is ignored. If this parameter is not provided, the default behavior is that only public expression declarations will be included.</p>
</div></td></tr><tr><td>IN</td><td>parameters</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/parameters.html">Parameters</a></td><td/><td><div><p>Any input parameters for the library. Parameters defined in this input will be bound by name to parameters defined in the CQL library (or included libraries, recursively). Parameter types are mapped to CQL as specified in the Using CQL section of this implementation guide. If a parameter appears more than once in the input Parameters resource, it is represented with a List in the input CQL. If a parameter has parts, it is represented as a Tuple in the input CQL. If parameter names are qualified, the parameter will be bound only to parameters in the library with the qualifier name, and the qualifier name must be the name of a library included by the library being evaluated (or an included library, recursively).</p>
</div></td></tr><tr><td>IN</td><td>useServerData</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/datatypes.html#boolean">boolean</a></td><td/><td><div><p>Whether to use data from the server performing the evaluation. If this parameter is true (the default), then the operation will use data first from any bundles provided as parameters (through the data and prefetch parameters), second data from the server performing the operation, and third, data from the dataEndpoint parameter (if provided). If this parameter is false, the operation will use data first from the bundles provided in the data or prefetch parameters, and second from the dataEndpoint parameter (if provided).</p>
</div></td></tr><tr><td>IN</td><td>data</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/bundle.html">Bundle</a></td><td/><td><div><p>Data to be made available to the library evaluation. This parameter is exclusive with the prefetchData parameter (i.e. either provide all data as a single bundle, or provide data using multiple bundles with prefetch descriptions).</p>
</div></td></tr><tr><td>IN</td><td>prefetchData</td><td/><td>0..*</td><td/><td/><td><div><p>Data to be made available to the library evaluation, organized as prefetch response bundles. Each prefetchData parameter specifies either the name of the prefetchKey it is satisfying, a DataRequirement describing the prefetch, or both.</p>
</div></td></tr><tr><td>IN</td><td>prefetchData.key</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/datatypes.html#string">string</a></td><td/><td><div><p>The key of the prefetch item. When using this operation as part of a CDS Hooks implementation, this SHALL be the name of a prefetch item in a CDS Hooks discovery response. Prefetch data SHALL be made available to retrieve statements in the CQL and SHOULD NOT be provided as the value of any CQL parameters in the library being evaluated to avoid confusion between context parameters and retrieve data.</p>
</div></td></tr><tr><td>IN</td><td>prefetchData.descriptor</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/metadatatypes.html#DataRequirement">DataRequirement</a></td><td/><td><div><p>A DataRequirement describing the content of the prefetch item.</p>
</div></td></tr><tr><td>IN</td><td>prefetchData.data</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/bundle.html">Bundle</a></td><td/><td><div><p>The prefetch data as a Bundle. If this part is missing, it indicates there is no data associated with this prefetch item.</p>
</div></td></tr><tr><td>IN</td><td>dataEndpoint</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/endpoint.html">Endpoint</a></td><td/><td><div><p>An endpoint to use to access data referenced by retrieve operations in the library. If provided, this endpoint is used after the data or prefetchData bundles, and the server, if the useServerData parameter is true.</p>
</div></td></tr><tr><td>IN</td><td>contentEndpoint</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/endpoint.html">Endpoint</a></td><td/><td><div><p>An endpoint to use to access content (i.e. libraries) referenced by the library. If no content endpoint is supplied, the evaluation will attempt to retrieve content from the server on which the operation is being performed.</p>
</div></td></tr><tr><td>IN</td><td>terminologyEndpoint</td><td/><td>0..1</td><td><a href="http://hl7.org/fhir/R4/endpoint.html">Endpoint</a></td><td/><td><div><p>An endpoint to use to access terminology (i.e. valuesets, codesystems, and membership testing) referenced by the library. If no terminology endpoint is supplied, the evaluation will attempt to use the server on which the operation is being performed as the terminology server.</p>
</div></td></tr><tr><td>OUT</td><td>return</td><td/><td>1..1</td><td><a href="http://hl7.org/fhir/R4/parameters.html">Parameters</a></td><td/><td><div><p>The results of the library evaluation, returned as a Parameters resource with a parameter for each named expression requested by the expression input parameter (or all public (or all, if includePrivate is true) top-level expressions defined in the library if no expression input parameter was specified). Note that explicit request for evaluation of an expression does not respect the access modifier (i.e. even private expressions can be evaluated by directly requesting evaluation of the expression by name).</p>
</div></td></tr></table></div>
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value="http://hl7.org/fhir/uv/cql/OperationDefinition/cql-library-evaluate"/>
<version value="2.0.0"/>
<name value="CQLLibraryEvaluate"/>
<title value="CQL Library Evaluate"/>
<status value="active"/>
<kind value="operation"/>
<experimental value="false"/>
<date value="2023-11-27T16:26:11+00:00"/>
<publisher value="HL7 International / Clinical Decision Support"/>
<contact>
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<value value="http://www.hl7.org/Special/committees/dss"/>
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<description
value="Evaluates the contents of a library and returns the results as a Parameters resource. Results are returned as described in the FHIR Type Mapping section of the conformance page of this implementation guide. Unless specific expressions are named, the operation will provide the results for all public top-level expression declarations in the library. Use the includePrivate parameter to indicate that private expressions should be included as well."/>
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<purpose
value="This operation is defined to support evaluating the contents of a library directly via an operation"/>
<affectsState value="false"/>
<code value="evaluate"/>
<resource value="Library"/>
<system value="false"/>
<type value="true"/>
<instance value="true"/>
<parameter>
<name value="url"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="The canonical url (with optional version) of the library to be evaluated. This parameter is only used when the operation is invoked at the type level, and is exclusive with the library parameter."/>
<type value="canonical"/>
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<parameter>
<name value="library"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="The library to be evaluated, provided as an input. This parameter is only used when the operation is invoked at the type level, and is exclusive with the url parameter."/>
<type value="Library"/>
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<parameter>
<name value="subject"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="Subject for which the library will be evaluated. This corresponds to the context in which the library will be evaluated and is represented as a relative FHIR id (e.g. Patient/123), which establishes both the context and context value for the evaluation"/>
<type value="string"/>
<searchType value="reference"/>
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<parameter>
<name value="expression"/>
<use value="in"/>
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<documentation
value="The identifier (optionally qualified) of the expression(s) to be evaluated, regardless of whether the declaration is private. If no expression names are provided, the operation evaluates all public expression definitions in the library (or all expressions if includePrivate is true). If an expression name is unqualified, it refers to the name of an expression defined in the library being evaluated. If the expression name is qualified, the name refers to an the identifier of an expression defined in the library with the qualifier name, and the qualifier name must be the name of a library included by the library being evaluated (or an included library, recursively). Note that this may result in expression results being included multiple times, as expressions in included libraries may be invoked multiple times from the library being evaluated."/>
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<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="Indicates whether to include private expression declarations in the result. Note that if expressions are named, this parameter is ignored. If this parameter is not provided, the default behavior is that only public expression declarations will be included."/>
<type value="boolean"/>
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<parameter>
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<use value="in"/>
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<documentation
value="Any input parameters for the library. Parameters defined in this input will be bound by name to parameters defined in the CQL library (or included libraries, recursively). Parameter types are mapped to CQL as specified in the Using CQL section of this implementation guide. If a parameter appears more than once in the input Parameters resource, it is represented with a List in the input CQL. If a parameter has parts, it is represented as a Tuple in the input CQL. If parameter names are qualified, the parameter will be bound only to parameters in the library with the qualifier name, and the qualifier name must be the name of a library included by the library being evaluated (or an included library, recursively)."/>
<type value="Parameters"/>
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<parameter>
<name value="useServerData"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="Whether to use data from the server performing the evaluation. If this parameter is true (the default), then the operation will use data first from any bundles provided as parameters (through the data and prefetch parameters), second data from the server performing the operation, and third, data from the dataEndpoint parameter (if provided). If this parameter is false, the operation will use data first from the bundles provided in the data or prefetch parameters, and second from the dataEndpoint parameter (if provided)."/>
<type value="boolean"/>
</parameter>
<parameter>
<name value="data"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="Data to be made available to the library evaluation. This parameter is exclusive with the prefetchData parameter (i.e. either provide all data as a single bundle, or provide data using multiple bundles with prefetch descriptions)."/>
<type value="Bundle"/>
</parameter>
<parameter>
<name value="prefetchData"/>
<use value="in"/>
<min value="0"/>
<max value="*"/>
<documentation
value="Data to be made available to the library evaluation, organized as prefetch response bundles. Each prefetchData parameter specifies either the name of the prefetchKey it is satisfying, a DataRequirement describing the prefetch, or both."/>
<part>
<name value="key"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="The key of the prefetch item. When using this operation as part of a CDS Hooks implementation, this SHALL be the name of a prefetch item in a CDS Hooks discovery response. Prefetch data SHALL be made available to retrieve statements in the CQL and SHOULD NOT be provided as the value of any CQL parameters in the library being evaluated to avoid confusion between context parameters and retrieve data."/>
<type value="string"/>
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<documentation
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<max value="1"/>
<documentation
value="The prefetch data as a Bundle. If this part is missing, it indicates there is no data associated with this prefetch item."/>
<type value="Bundle"/>
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<parameter>
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<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="An endpoint to use to access data referenced by retrieve operations in the library. If provided, this endpoint is used after the data or prefetchData bundles, and the server, if the useServerData parameter is true."/>
<type value="Endpoint"/>
</parameter>
<parameter>
<name value="contentEndpoint"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="An endpoint to use to access content (i.e. libraries) referenced by the library. If no content endpoint is supplied, the evaluation will attempt to retrieve content from the server on which the operation is being performed."/>
<type value="Endpoint"/>
</parameter>
<parameter>
<name value="terminologyEndpoint"/>
<use value="in"/>
<min value="0"/>
<max value="1"/>
<documentation
value="An endpoint to use to access terminology (i.e. valuesets, codesystems, and membership testing) referenced by the library. If no terminology endpoint is supplied, the evaluation will attempt to use the server on which the operation is being performed as the terminology server."/>
<type value="Endpoint"/>
</parameter>
<parameter>
<name value="return"/>
<use value="out"/>
<min value="1"/>
<max value="1"/>
<documentation
value="The results of the library evaluation, returned as a Parameters resource with a parameter for each named expression requested by the expression input parameter (or all public (or all, if includePrivate is true) top-level expressions defined in the library if no expression input parameter was specified). Note that explicit request for evaluation of an expression does not respect the access modifier (i.e. even private expressions can be evaluated by directly requesting evaluation of the expression by name)."/>
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IG © 2023+ HL7 International / Clinical Decision Support. Package hl7.fhir.uv.cql#2.0.0 based on FHIR 4.0.1. Generated 2025-07-08
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