- From: Geoffrey M. Clemm <geoffrey.clemm@rational.com>
- Date: Tue, 16 Jan 2001 22:09:41 -0500 (EST)
- To: ietf-dav-versioning@w3.org
From: Greg Stein <gstein@lyra.org> As a variant of my previous question, how would I fetch a particular file from a particular baseline on a readonly server? Specifically, if I'm not allowed to do a MKCOL, a BASELINE-CONTROL, or an UPDATE (on an existing baseline selector), then how can I use a baseline? OK, I was wavering before, but now you've pushed me over the edge. I believe it is reasonable to do what you want, and you shouldn't have to do a "write" operation to get it. So I propose the following: Add a DAV:baseline-collection property on a baseline, which holds a DAV:href containing a server-defined URL. This URL identifies a read-only collection that exposes that baseline as a collection. Access to that read-only collection would be the message to the server to "cache" that baseline as a collection. The server would then just have to automatically clean up that cache when it needs the space, rather than counting on a DELETE from the client to tell it when to do so. This is a burden on the server, but probably not an unreasonable one. In particular, I don't think that Greg's will be the only server that will have very different performance/implementation tradeoffs for a read-only view of a baseline (what Greg wants) and a writeable view of a baseline (aka a workspace). Conceivably, I could get the version-history for a given VCR, use a DAV:baseline-version report to find the specific version of that collection, get the collection version's members and execute DAV:baseline-version on those, etc. But this is a far cry from random-access to a specific path within a baseline. Yes, that would be really gross. Note that I can't simply use the Depth: header, as that would apply "once" to the collection version history (which has no children); the Depth header would not apply to the collection versions. Yes, that wouldn't work. So, Greg: Does the DAV:baseline-collection property on a baseline give you what you want (I presume, yes). So, everyone else: any objections? (For Greg at least, I presume, no :-). Cheers, Geoff
Received on Tuesday, 16 January 2001 22:10:36 UTC