From: MAISONNY Benoit (Benoit.MAISONNY@eurocontrol.int)
Date: Fri Mar 26 2004 - 02:28:44 PST
Hi Alexander,
Thanks for your response. I wanted to be sure I didn't miss some new feature in 3.7 which would incur the changes.
I know that AT format is subject to change, but we need a page-oriented format for page comparisons, so we'll stick to that until we find a better solution.
If possible, it would be nice of RenderX to mention when a new version is subject to alter the AT file format.
As for Uwe's response: you're mostly correct in your analysis of the problem. Of course we do have change management elements in the XML source, but this is irrelevant. As you realised at the end of your message, the problem I was mentioning is related to page comparison, not to finding what has changed in the content flow. Shifted content is just one issue among others, which forces us to use a page-oriented format.
I've been looking at alternatives, using some other tools to process/compare the PDF files directly, but haven't found a better solution so far.
Cheers,
Benoit Maisonny
> -----Original Message-----
> From: owner-xep-support@renderx.com
> [mailto:owner-xep-support@renderx.com]On Behalf Of Alexander Peshkov
> Sent: Wednesday, March 24, 2004 2:24 PM
> To: MAISONNY Benoit
> Subject: Re: [xep-support] text positioning differences between XEP
> 3.6.3 and 3.7.x
>
>
> Hello Benoit,
>
> Those differences can appear due to the new functionality, improved
> formatting algorithms or rounding precision. We do not guarantee any
> kind of stability for coordinates in the AT format, this format is not
> supposed to be used for document versioning control. Therefor you have
> to either restrain from XEP upgrades or use different means for
> document control.
>
> Best regards,
> Alexander Peshkov
> mailto:peshkov@renderx.com
> RenderX
>
> MB> Hi,
>
> MB> We compared the AT files produced from the same FO file
> using different versions of XEP, and found differences in the
> positioning and width of elements. For example:
>
> MB> xep363: <xep:text value="Copyright " x="332218" y="46987"
> width="36456"/>
> MB> xep372: <xep:text value="Copyright " x="332386" y="46989"
> width="36440"/>
>
> MB> In some cases, the differences in "y" value can amount to
> 10000. The difference in width is probably the cause of the
> positioning differences. Perhaps you changed the algorithm to
> compute the
> MB> characters' size?
>
> MB> Of course, we are using the same fonts.xml file, on the
> same computer, to compare results.
>
> MB> Is there a way to avoid these differences? We need to
> find which pages have changed between 2 versions of a
> document, and we are using the AT format to spot any
> difference. But in this case, the
> MB> differences on the page are due to XEP, not to any change
> in content.
>
>
> MB> Thanks,
> MB> Benoit Maisonny
>
>
>
> MB>
> ......................................................................
> MB> Benoit MAISONNY
> benoit.maisonny@eurocontrol.int
> MB> eAIP development & support
> http://www.eurocontrol.int/ais/eaip
> MB> EUROCONTROL Aeronautical
> Information Management
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