Matter Realised By A Discontinuous Minor Process?

concerning	participant identification
minor Process	Range

as concerns	participant identification
minor Process	Range

                      

as far as concerns	participant identification
minor Process	Range

as far as	participant identification	is concerned
minor	Range	Process

This last formulaic expression, unlike a clause, cannot be expanded with further transitivity functions.  Like a prepositional phrase, only the element functioning as Range or minor Process can be expanded.

The form is that of the 'respective' conjunctive Adjunct: as far as that's concerned (Halliday & Matthiessen 2014: 108).