The Blueprint language is an XML markup set based partly on XForms. Applications are hosted on your own Web server, which must respond to HTTP requests from Yahoo!'s server by returning valid Blueprint pages; Yahoo!'s server acts as an intermediary between your application and the end-user's hand-held device. To host a Blueprint application, you must submit a package containing configuration and resource files to Yahoo!. The application package does not contain any Blueprint markup or scripting code; these are supplied directly by your server at runtime.

This guide shows how to deploy a Blueprint application on the mobile Web. Once deployed, the application is available using a standard browser on any supported device.