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- From: James Robertson <email@example.com>
- To: "XML Developers' List" <firstname.lastname@example.org>
- Date: Fri, 26 Mar 1999 09:20:58 +1000
At 21:55 25/03/1999 , David Megginson wrote:
| > > Anyway, let's get this right -- I think that it's healthy for
| > > both Gnumeric and the KOffice Spreadsheet program both to exist,
| > > but there is no excuse for them to use entirely incompatible
| > > formats. As a matter of fact, if we could convince KDE and Gnome
| > > to use compatible XML formats for lots of things (like interface
| > > construction), the media's predictions of a Linux fracture will
| > > be proven to be hot air.
| > Although I agree to an extent, if they have different feature sets
| > it's pretty unlikely that you're going to get an entirely perfect
| > agreement on a spreadsheet DTD.
| I disagree *very* strongly -- with Namespaces, we can design a common
| format for the 90% of functionality that the two spreadsheets actually
| have in common (text cells, data cells, basic formulas, general
| formatting information [font, alignment, colour, size], etc.) and
| then allow each to provide extended information
| unambiguously-delimited through the use of separate namespaces.
| The more material in the common spec, the better interoperability.
| Linux needs to set an example here.
Why do namespaces help us here?
* Breaks validation. We are no longer able to ensure that the
files we are reading/creating are correct and useful.
* Still has the variations between applications, so that a reader
of a given format still needs to know 100% about what is that
Without the rigour of a DTD, we've got nothing.
Particularly since this data may well live long, and is not
some transient "sent over the web" data.
How will future users make sense of the format without
| > However, that's the beauty of XML. Writing a converter from one
| > format to another is trivial in the extreme, so it's not a huge
| > issue in my (humble) opinion.
| For n XML-based formats, we need (n * (n - 1)) converters. If there
| are only two different XML-based spreadsheet formats, then we need
| only two converters:
| a => b
| b => a
| If there are three XML-based different formats, then we need six
| a => b
| a => c
| b => a
| b => c
| c => a
| c => b
Again, having namespaces doesn't solve this problem. Regardless
of what you call it, if the formats are different, they're different.
But anyway, this reasoning isn't necessarily true. What about:
a => x
b => x
c => x
x => a
x => b
x => c
That is, an intermediate DTD that captures all the usefully
sharable data. For a successful example of this, see the
Rainbow DTDs for word documents.
This greatly reduces the number of conversions as the
number of formats increases.
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