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It occurs to me that Postscript and PDF have dealt with this for imaging models that work 
consistently.  Here, the "in" is to a renderer, but the model for representation of decimal 
expressions of find-sensitivity values seems to have been handled (for years).  Those 
specifications may be some help too.

 - Dennis

-----Original Message-----
From: Thorsten [mailto:netsroth@googlemail.com] On Behalf Of Thorsten Behrens
Sent: Wednesday, June 20, 2012 06:32
To: Dennis E. Hamilton
Cc: 'libreoffice-dev'
Subject: Re: Difficulties with Flat XML under source control

Dennis E. Hamilton wrote:
For out-in (which this is, presumably), you want to record a
decimal expression of the internal value that will convert back to
the exact internal value on re-input.  (The in-out case is that
the input conversion provide whatever internal representation that
will convert to the read value on re-output.  Without additional
information, it is generally very difficult to have these be the
same.)

It is also desirable, of course, that any other ODF consumer use
the same technique so that its in-out conversion satisfies the
out-in condition of the original source of the decimal expression
of the value.  

Hi Dennis,

yes - but in a first approximation, one can probably relax this a
bit (for the use case at hand): only _after_ the first save
operation this needs to hold. Also, most people would probably be
contempt with this to work for *one* ODF editing application.

It is also desirable, of course, that any other ODF consumer use
the same technique so that its in-out conversion satisfies the
out-in condition of the original source of the decimal expression
of the value.  

Note that there's a difference between spreadsheet values (for which
I think de facto the above holds true - likely everyone stores those
in IEEE doubles), and other content: consumers might employ rather
complex transformations to arrive at internal values, given e.g. a
gradient center coordinate - asking for common behaviour is very
close to asking for a common ODF application model.

Cheers,

-- Thorsten


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