Canonical structural spine
The work's own structure
Reviewed edition: Questio de aqua et terra, ed. Pistelli, legacy DanteOnline digital work. It is not the current National Edition; SDI lists the Fioravanti-Tabarroni Questio de Aqua et Terra as in preparation. Division axes: section. Structural nodes alone do not assert commentary citations.
Record-local commentary evidence
Commentary citations: work locus ↔ Dante locus
These citations occur in later commentary. They do not, by themselves, mean Dante cited this work.