Introduction

Introduced in OS X v10.5, Publication Subscription is a technology that offers developers a way to subscribe to web feeds from their applications. Web feeds are documents that contains frequently updated information. You can use Publication Subscription to allow your applications to subscribe to podcasts, photocasts, and any other feed-based document. Plus, Publication Subscription handles all the feed downloads and updates automatically. This document explains how feeds work and how to use them in your application.

Before reading this document, you should have some experience with Objective-C and be familiar with XML.

Organization of This Document

This book contains the following chapters:

• Understanding Feeds describes what feeds are and how they work.

• Publication Subscription Overview explains the architecture of Publication Subscription.

• Subscribing to a Feed explains how to use Publication Subscription to subscribe to a feed.

• Viewing and Retrieving Content describes how to read the data in a feed.