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Re: Changes to iCalender ontology to make calendar files diffable

From: Tim Berners-Lee <timbl@w3.org>
Date: Wed, 24 Mar 2004 11:10:23 -0500
Message-Id: <C18EE680-7DAD-11D8-BE2C-000A9580D8C0@w3.org>
Cc: www-rdf-calendar@w3.org
To: Graham Klyne <GK@ninebynine.org>

Ooops.  Sorry, No, Graham, [1] should have been to  "Diff, patch, 
update, sync"
[1] http://www.w3.org/DesignIssues/Diff
which points to an actual program
[3] http://www.w3.org/2000/10/swap/diff.py

The algorithm in diff.py is to find a mapping corresponding nodes in 
the two graphs
because they have the same URI or literal value or they are connected 
by an [inverse]
functional property to nodes which have already been mapped as 

It isn't the pretty-printing-like algorithm which you use in [2].
It only works on a subset of graphs which have are well labelled, but 
the resulting
diff file has useful property that you can apply it to anything without 
fear of
generating falsehoods.

The update language looks like for example
[4] http://www.w3.org/2000/10/swap/test/delta/t2/patch.n3


On Mar 24, 2004, at 6:45, Graham Klyne wrote:

> At 16:36 23/03/04 -0500, you wrote:
>> To make the graph labelled enough for doing a diff,[1], with calendar 
>> data, here are the fixes I had to make (a copy of) to the ontology:
> I didn't see a reference given for '[1]'.  If it's my 
> graph-differencing function [2], I'd be interested to see the problem 
> data, as my algorithm doesn't depend *entirely* on graph labels.  If 
> not mine, I'd be interested to know of other approaches.
> #g
> --
> [2] http://www.ninebynine.org/RDFNotes/Swish/Intro.html#GraphDiff
> ------------
> Graham Klyne
> For email:
> http://www.ninebynine.org/#Contact
Received on Wednesday, 24 March 2004 11:11:38 UTC

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