---
type: "sdc-page"
title: "SDC: StructureDefinition-sdc-library-intro"
source: "sdc/input/pagecontent/StructureDefinition-sdc-library-intro.xml"
---
# SDC: StructureDefinition-sdc-library-intro

### Scope and Usage

This profile extends the [CQL Library]({{site.data.fhir.path}}cqllibrary) Profile to support FHIRPath expressions and FHIR query in addition to CQL as contents. Note: This profile has similar elements with the [cpg-computablelibrary](http://build.fhir.org/ig/HL7/cqf-recommendations/StructureDefinition-cpg-computablelibrary.html) Profile but could not be used as the base for this profile because of its 1..1 constraint on CQL as content.