Halliday & Matthiessen (2014: 512):
In a quoting nexus the ‘tactic’ relationship, the type of dependency, is parataxis; the two parts have equal status. The projected clause retains all the interactive features of the clause as exchange, including the full mood potential (with the option of mood tagging in ‘declarative’ and ‘interrogative’ clauses), vocatives and expletives, tone selections, and (textual) continuatives.