990. Besides the obligations arising as hitherto described (that is, from contracts, quasi-contracts, delicts and quasi-delicts) there are others which have their origin in special enactments, or in the relation existing between one person and another independently of the act or will of either, or in both of these causes combined.
Such are obligations attaching to the position or condition—
of public officers;
of traders;
of parents;
of children, as (e.g.), that of a child to furnish the necessaries of life to an indigent parent;
of tutors and other administrators who are compelled to act as such, and of owners of adjoining properties; and the obligations consequent upon fortuitous events.