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

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