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

> **Note:** This extension has been superceded by the [definitionExtract](/sdc-structuredefinition-sdc-questionnaire-definitionextract-intro) extension. Please migrate to that extension, however this one will remain for backward compatibility.  
> This extension does not support defining a profile to create, and the expression (x-fhir-query) was not deemed sufficiently implementable.

Additional details on the use of this extension can be found on the [Data Extraction](/sdc-extraction#definition-based-extraction) page.