Martin (1992: 181):
In other modes, where language is constitutive of what is going on, the distinction between external and internal relations is vital. The temporal organisation of such texts will be quite different from that of the institutional events to which they refer and internal relations will prove critical in signalling this textual organisation.
This again confuses the ideational metafunction with the textual metafunction. External temporal conjunctive relations do not refer to 'institutional events'. External temporal relations, like internal conjunctive relations, are concerned with textual organisation: they are cohesive resources for marking textual transitions between messages or groups of messages. These relations between messages are distinct from the construals of experience thus conjuncted.