Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Creating Apps
App Overview
Designing App UI
Creating App Templates
Content Security Policy Overview
Styling Apps
Using JavaScript
JavaScript Cookbook
Using Apex
Controlling Access
Application Access Control
Interface Access Control
Component Access Control
Attribute Access Control
Event Access Control
Using Object-Oriented Development
Caching with Storage Service
Using the AppCache
Distributing Applications and Components
Debugging
Reference
PDF

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Attribute Access Control

The access attribute on the aura:attribute tag indicates whether the attribute can be used outside of the attribute’s namespace.

Possible values are listed below.

Access Description
private Available within the component, app, interface, or event and can’t be referenced externally.
public Available within the same namespace. This is the default access value.
global Available in all namespaces.