dbus-introspect-get-method is a compiled Lisp function in `dbus.el'.

(dbus-introspect-get-method BUS SERVICE PATH INTERFACE METHOD)

Return method METHOD of interface INTERFACE as XML object.
It must be located at SERVICE in D-Bus BUS at object path PATH.
METHOD must be a string, element of the list returned by
`dbus-introspect-get-method-names'. The resulting "method"
object can contain "arg" and "annotation" children.