1. A computer-implemented method of calling a web service interface, the method comprising: deriving, by a computing device, the web service interface from a user interface form, the web service interface making an application on an application server available using web services description language; and sending, by a computing device, a service request via the web service interface to the available application, the web service interface defining a web service field, the web service field derived from user interface form metadata, the user interface form metadata specifying a field within a database table shown on the user interface form, and a web service method, the web service method related to an operation of the user interface form.