On Tue, 15 Nov 2011, tiddlygrp wrote:
For the client tw adding a uuid doesn't matter directly. It wouldn't allow for tiddlers with different titles to exist, as it is forbidden in tw now. It would be just an extra field. In fact just introducing a uuid field needs no user interface.
Yes.
The uuid is important to establish a standard a server or another client can count on.
Yes, something that has been bewildering me in the back and forth about this is the discussion about "semantics of uuids". If we're talking about uuids in the RFC 4122 sense or in the sense of universally unique identifiers then the exact point of having such things is because they _don't_ have semantics. An identifier which is persistent and unique may not have semantics. So question really becomes one of representational syntax, and tiddlers already provide us with the fields attribute and if we want deep coverage we have to use uuid4 (as it can be done without access to the hosting system) and since we are using fields the stored information must be a string, of hex digits. In Python that's:
import uuid str(uuid.uuid4())
'0d9b98c0-5f73-45eb-ac4a-386d445905e3' The goal of an identifier is not to provide meaning or activity, it is simply to allow something to be identified in a process. In a universe of tiddlers, the tiddler title can _never_ be the id becuase it will never be unique. The host of the tiddler plus the title can never provide an id either, because we want tiddlers to be able to move. So you have to make the tiddler have a unique id, without meaning. And, if you want that id to actually work as an identifier througout the entire lifecycle of the tiddler where it may go or do, it _has_ to be created when the tiddler is born. Similarly, in order for the id to remain "safe" it must _never_ encode information about the tiddler in itself. No hash of the title and host or anything like that. Doing so means that the identifier has gained semantics and when it does, it isn't a _universal_ identifier any more, and in order for federation (migratory tiddlers) to work they have to have identifiers that are universal. -- Chris Dent http://burningchrome.com/ [...] -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/tiddlywiki?hl=en.
