Halliday & Matthiessen (2014: 462):
Paratactic (notation 1 =2). The combination of elaboration with parataxis yields three types, the first two of which could be regarded as apposition between clauses:(i) exposition ‘in other words’ P i.e. Q
(ii) exemplification ‘for example’ P e.g. Q
(iii) clarification ‘to be precise’ P viz. Q