From koffice-devel  Sun Mar 28 18:03:33 2010
From: Thomas Zander <zander () kde ! org>
Date: Sun, 28 Mar 2010 18:03:33 +0000
To: koffice-devel
Subject: Re: Fwd: Change Tracking of Lists - Storing delete fragments
Message-Id: <201003282003.34532.zander () kde ! org>
X-MARC-Message: https://marc.info/?l=koffice-devel&m=126980028919836

On Friday 26. March 2010 05.57.41 Ganesh Paramasivam wrote:
> Forwarding this here for future reference.
> 
> - Ganesh
> 
> ---------- Forwarded message ----------
> From: Ganesh Paramasivam <ganesh@crystalfab.com>
> Date: Fri, Mar 26, 2010 at 10:25 AM
> Subject: Change Tracking of Lists - Storing delete fragments
> To: office-comment@lists.oasis-open.org
> 
> 
> Hi,
> 
> I'm currently implementing ODF change tracking in KWord, and there
> doesn't seem to be a way to store delete changes in lists in a ODF
> complaint way for some scenarios. For example, if we have a list like
> this
> 
> 1. This is a list-item-1
> 2. This is a list-item-2
> 3. This is a list-item-3
> 4. This is a list-item-4
> 
> And we delete the second-half of the first list-item and the first
> half of the second list-item
> 
> 1. This is a list-item-1
>              -----------------
> 2. This is a list-item-2
> -------------
> 3. This is a list-item-3
> 4. This is a list-item-4
> 
> If I were to follow the ODF delete change loading rules, we should
> have a delete fragment which looks like this
> 
> <p>a list-item-1</p></list-item><list-item><p>This is a</p>
> 
> However, such a fragment would result in a invalid XML file and
> consequently an invalid ODF File.
> 
> The KWord approach to solving this problem is that we store the delete
> fragment like this
> 
> <list xml:id="list1"><list-item xml:id="list-item1"><p>a
> list-item-1</p></list-item><list-item>This is a</list-item></list>
> 
> and use the RDF metadata to specify that "list1" and "list-item-1" are
> not to be considered as a valid list and list-item respectively. So
> while loading this delete-change, on encountering a list or a
> list-item, we check whether it is a valid list or list-item and if
> they are not valid we merge the delete change into the current list
> and list-item respectively. This solution is very robust in handling
> any type of list-delete changes ( There are multiple other scenarios
> with similar problems that I haven't illustrated in this mail ).
> 
> We would like to see this problem addressed in the spec, so that we
> can have a inter-operable way to do this.

Would this usecase be easier to solve using <text:numbered-paragraph> 
elements?

Ideally KOffice has to start writing those out again some day for usecases where 
its shorter than the list+listitem construct.
-- 
Thomas Zander
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