The UP.Link platform provides a Service Registry, which coordinates interaction between HDML services. The Service Registry allows the user to designate services to perform specific categories of tasks. The user can register services under the following categories:
Email: an email service that can send electronic mail.
AddrBook: the user's preferred address book service. The service should support at least the picking of email, phone, and fax addresses.
ToDo: the user's preferred To Do list service.
The Service Registry provides a generic URL for the services in each registry category. For example, the generic URL for the Email service is:
After the user has registered a service, the Service Registry redirects any requests for the generic URL to the registered service's URL. For example, suppose the user registers a service with the URL http://mymail.foo.com as an email service. The service registry redirects any requests for device:home/goto?svc=Email to http://mymail.foo.com.
The service registry makes it easy for other services to issue requests to the user's registered services. For example, if your service needs to send an email message on behalf of the user, you don't need to know about http://mymail.foo.com; you can simply request device:home/goto?svc=Email. The Service Registry automatically redirects the request to the correct URL.
The user can register more than one service for each category. For example, the user can register multiple email services. If the user has registered multiple services for a category, the phone displays a choice list of the services each time the category URL is requested. The user chooses which service the request gets redirected to.