四分律刪繁補闕行事鈔 2.127

2.127

若論作法，下卷明之；今明自然，有十五界。《四分》有十一種。一僧伽藍界，二者村界，各有四種；謂周匝垣牆、柵籬、籬牆不周、四周有屋也。此等諸相不周，伽藍相壞，樹車等界叢生，故云若干界。此止是別界，不名僧村二所。今言若干界者，有上三礙互生，來往譏難，故失衣也。《僧祇》、《五分》中：同界者，僧羯磨作不失衣界，於中得自在往反；異界者，不得自在往反是也。乃至舍屋、尼寺、聚落、重屋、車乘場、露地、道行界亦爾。

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.