Discourse connectives and other markers that transition between ideas or convey speaker attitude/hedging/emphasis/attribution but do not belong to propositional content. Examples include:
This label also covers “additive focusing markers” (Huddleston and Pullum, 2002, p. 592) with a meaning similar to ‘also’ or ‘too’, where an item is added to something already established in the discourse:
It also covers topicalization markers:
Finally, `d applies to adpositions relating a metalinguistic mention of a speech act to the speech content itself—whether the adposition introduces this speech act mention, as in #005, or links the discourse expression to a subordinate statement, as in #006.