You define a function in Software AG Designer. In the Apama Developer perspective, select File > New > Scenario Function. You are prompted for some metadata, and then a skeleton function definition file (.fdf) is created, which is an XML file. The skeleton file indicates where you need to add data and what kind of data you need to add.

See Creating new scenario functions for details about the scenario function definition file format.

The content of a function definition file must comply with the DTD in the etc/fdf.dtd file in the Apama installation directory.