The 2 footnotes for the term in the Vism:
page 19: 11. The Suttavibhanga, the first book of the Vinaya Piþaka, contains in its two parts
the 227 rules for bhikkhus and the rules for bhikkhunìs, who have received the admission
(upasampadā), together with accounts of the incidents that led to the announcement of
the rules, the modification of the rules and the explanations of them. The bare rules
themselves form the Pātimokkha for bhikkhus and that for bhikkhunìs. They are also
known as the “two codes” (dve mātikā). The Pātimokkha is recited by bhikkhus on the
Uposatha days of the full moon and new moon.
page 87: Dve mātikā—the “two codes”: see Ch. I, n. 11. But Vism-mhþ says here: “‘Observers
of the codes’ are observers of the codes (summaries) of the Dhamma and
Vinaya” (Vism-mhþ 117).