FDK File object constructors

Hi All,

I like to transpose an ESTK script to a FDK command.
The ESTK script reads an XML file and set the content of some variables in a FM template file based on a key selection.
Key and variables data are all defined in the XML file.

All information about file object for an ESTK script are available in Adobe JS Tools Guide.

Where may I find similar information for a FDK development?

Thanks.