svara_definition_and_eternity
Svara (interval) is the colouring/delighting component of rāga (through specific svara, varṇa, dhvani); svara is eternal/indestructible; classified fourfold beginning with vādin; manifested through śrutis.
Body (pseudocode)
svara := interval_that_colours(mind_of_good); attributes := {eternal: True, indestructible: True}; classification := fourfold{vadin, ...}; manifestation_cause := sruti