---
type: "search-params"
title: "Linkage Search Parameters"
resource: "Linkage"
---
# Linkage Search Parameters

<a id="author"></a>

## author
**Description:** Author of the Linkage

**Type:** reference

**Expression:** Linkage.author

**Path:** Linkage.author

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/Linkage-author


<a id="item"></a>

## item
**Description:** Matches on any item in the Linkage

**Type:** reference

**Expression:** Linkage.item.resource

**Path:** Linkage.item.resource

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/Linkage-item


<a id="source"></a>

## source
**Description:** Matches on any item in the Linkage with a type of 'source'

**Type:** reference

**Expression:** Linkage.item.resource

**Path:** Linkage.item.resource

**Standards Status:** normative

**URL:** http://hl7.org/fhir/build/SearchParameter/Linkage-source