Introduction
This guide explains how to write mobile applications for the Yahoo! BlueprintTM Platform. Specifically, it documents the Blueprint markup language and provides instructions for developing, testing, and publishing mobile Internet services.

Understanding the Yahoo! Blueprint Platform

• Using Blueprint, third-party developers can provide custom content and services in a variety of ways. Applications can be Yahoo! Go Mobile Widgets, browser-based Mobile Sites, or stand-alone Mobile Apps:
• Mobile Widgets run under Yahoo! Go. Users can subscribe to published Widgets by selecting them from the Widget Gallery and add Widgets to the Yahoo! Go carousel for faster access.
• Mobile Sites are accessible from any standard Web browser. Once published, they can be found using the search facility on Yahoo!’s mobile homepage.
• Mobile Apps rely on a stand-alone version of the Blueprint runtime installed on the user’s phone.

They are accessed independently of both Web browsers and Yahoo! Go. The deployment sections in this guide focus on Widgets. For information about publishing Mobile Sites and Mobile Apps, see the supplementary documents available from Yahoo!’s Mobile Developer site.