Implementing device support in a web-based enterprise application

A method, system, application programming interface, and computer program product that enable enterprise data management application programs to request input/output services from a device manager controlling devices. The device manager operates in a heterogeneous environment including incompatible devices provided by multiple vendors. These requests, and responses from the device manager to the enterprise data management application program, are communicated in a markup language format, rather than in a device-specific native language. This structure enables the vendor of the enterprise data management application program to send requests for services, including both data and instructions to use specialized features of a device, without the need to change the enterprise data management application program to support device-specific native languages.