---
type: "resource-definitions"
title: "extension-operationdefinition-allowed-type Definitions"
resource: "extension-operationdefinition-allowed-type"
---

# extension-operationdefinition-allowed-type Definitions

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

## Extension
Which types are allowed for a parameter, when the base type is Abstract

**Definition:** When the base type is an abstract type (e.g. Resource or Element) then this extension defines which concrete types are allowed to be used for a parameter. In the absence of this extension, any type is allowed.

**Cardinality:** 0..*


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

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


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

## Extension.url
**Fixed:** fixedUri=http://hl7.org/fhir/StructureDefinition/operationdefinition-allowed-type


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

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

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