- From: <dlaliberte@gte.com>
- Date: Thu, 5 Nov 1998 13:20:36 -0500 (EST)
- To: "Larry Masinter" <masinter@parc.xerox.com>
- Cc: "Yaron Goland" <yarong@microsoft.com>, "Webdav" <w3c-dist-auth@w3.org>
Larry Masinter writes: > You'd also be better of saying that an 'internal member' can only > occur twice, that is, if http://host/coll/ is the collection and Do you mean "can not occur twice", or "can only occur once"? > http://host/coll/mem and http://host/coll/MEM are both URIs of the > same resource, that the resource is a member only once. It is conceivable that a single resource might be used in different ways, different roles, within the same collection. But that job ought to be done by different properties of the collection rather than different collection members. So Larry is proposing that collections should be sets rather than bags (perhaps that part is not new), and the identity of elements is determined by somehow comparing the resources rather than by comparing the URIs for them. This would be doable if the resources could provide some preferred URI to identify them with, or perhaps a hash of their current content, or if the resources had an EQUALTO method that could be called to compare itself with another resource however it wanted to. For ordered collections, if they are ever to be supported, this rule could be changed because each element would be indexed in addition to having a URI. The index makes each element unique, in a sense, so the same resource could occur many times in a collection. -- Daniel LaLiberte dlaliberte@gte.com (was: liberte@ncsa.uiuc.edu) liberte@hypernews.org
Received on Thursday, 5 November 1998 13:23:28 UTC