---
type: "resource-definitions"
title: "extension-operationoutcome-file Definitions"
resource: "extension-operationoutcome-file"
---

# extension-operationoutcome-file Definitions

<a id="Extension"></a>

## Extension
Source of a validation message

**Definition:** Identifies the logical module/software section responsible for identifying the issue.

**Comments:** This is a high-level category. Information such as a stack track should be conveyed in the issue.detail

**Requirements:** When debugging issues, it's helpful to know where within the logic stack an issue was identified

**Cardinality:** 0..1


<a id="Extension.extension"></a>

## Extension.extension
**Cardinality:** 0..0


<a id="Extension.url"></a>

## Extension.url
**Fixed:** fixedUri=http://hl7.org/fhir/StructureDefinition/operationoutcome-issue-source


<a id="Extension.value[x]"></a>

## Extension.value[x]
**Cardinality:** 1..*

**Type:** [string](/string)