[XXE] Developer Documentation Question

[Bennett Smith]

In the DocBook xslMenu.incl file there is a command named "docb.toPS" that
contains a calls a number of commands for which I cannot locate
documentation.  Some of the commands I am looking for are:

        copyDocument
        copyProcessResources
        transform
        processFO

I have the Developer's Guide and the Power User's Guide, but cannot find
these commands in them.  Where should I be looking for these?

Thanks

-- Bennett