四分律刪繁補闕行事鈔 2.127

2.127

Regarding formally enacted boundaries, it is explained in the lower scroll; now explaining the natural boundaries, there are fifteen boundaries. The Dharmaguptaka Vinaya has eleven kinds: first, the saṅghārāma boundary; second, the village boundary. Each has four types: enclosed all around by walls, fences/hedges, walls or fences incomplete, or houses on all four sides. When these various marks are incomplete, the characteristics of the saṅghārāma are broken, and boundaries such as trees and carts proliferate in thickets; thus it says 'several boundaries'. These are merely separate boundaries, not called the two places of saṃgha and village. Now when speaking of 'several boundaries', it is because the above three obstructions arise interchangeably, causing difficulties of reproach in coming and going, and thus the robe is lost. In the Mahāsāṃghika-vinaya and Pañcavargika-vinaya: 'In the same boundary, where the saṃgha performs a karman to make an unseparated-robe boundary, one may move back and forth at will within it; in a different boundary, one cannot move back and forth at will.' This is also true up to houses, nunneries, settlements, multi-storied buildings, cart-sheds, open grounds, and route-walking boundaries.