---
type: "fhir-fhirpath-function"
title: "FHIR FHIRPath Function: %factory.Extension"
source: "source/fhirpath.html"
---

# FHIR FHIRPath Function: %factory.Extension

This page is part of **FHIR FHIRPath** (FHIR-specific extensions). Base spec lives at [FHIRPath](/fhirpath).

`%factory.Extension(url, value) : Extension`

Creates an extension with the given url and value: `%factory.extension('http://hl7.org/fhir/StructureDefinition/artifact-copyrightLabel', 'CC0-1.0')`.

Parameters:

-   **url**: a string value that identifies the extension
-   **value**: the value of the extension ([any valid type](datatypes#open) for [extension.value\[x\]](extensibility)

**Return Value:** An extension with the specified properties.

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