Re: [xep-support] text positioning differences between XEP 3.6.3 and 3.7.x

From: Alexander Peshkov (peshkov@renderx.com)
Date: Wed Mar 24 2004 - 05:23:38 PST

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    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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