An Internet service can contain the following components:

• Service description: parameters that describe how the service is to be carried out. The most important of these are the logon data and, details of the transaction that is to be carried out.
• HTML templates: Templates are used to implement the graphic user interface and dialog logic of the Web application.
• MIME objects: These can be icons, graphics, Java applets, or sound/video components that you use to extend the user interface in the Web environment. There are language-specific and non-language-specific MIME objects.
• Language resources: A language resource contains all the texts that are required to execute a service in a particular language. They ensure that the ITS-based application is not language-specific.
• JavaScript files: A collection of JavaScript functions can be rolled out to a separate object.

A concrete instance of a service is defined by a theme. A theme has its own set of HTML templates, language resources, MIME objects and JavaScript files, and gives a service a particular appearance. The actual function of the service remains unchanged.