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https://issues.apache.org/jira/browse/FOP-1760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15412295#comment-15412295
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Jan Tošovský commented on FOP-1760:
-----------------------------------

The current patch implements fix for FOP-2640.

> [PATCH] FOP doesn't support change bar generation
> -------------------------------------------------
>
>                 Key: FOP-1760
>                 URL: https://issues.apache.org/jira/browse/FOP-1760
>             Project: FOP
>          Issue Type: Bug
>          Components: unqualified
>    Affects Versions: trunk
>         Environment: Operating System: All
> Platform: All
>            Reporter: Stephan Thesing
>         Attachments: change-bars.fo, change_bars_diff.txt, changebar.diff, 
> changebar_20110308.diff, changebars.fo, changebars.pdf, 
> changebars_20110512.diff, diff_1691612.diff, diff_2010_03_06.txt, 
> fop_20120507.diff, fop_changebars_20120506.diff, 
> patch_against_rev_1686494_2015-06-19.patch, 
> patch_against_rev_1690781_2015-07-19.patch, 
> patch_against_rev_1755460_2016-08-07.patch, test.fo, test.pdf
>
>
> In order to produce change bars along the columns for changed contents,
> FO supports the fo:change-bar-begin and fo:change-bar-end elements.
> These are not supported by FOP.
> Support for change bars should be added.
> Effort needed
>  - add parsing and validation of fo: elements
>  - determine fo elements under influence of one or more change bars
>  - when creating areas from such affected fo elements, create additional areas
>     representing the change bars as defined in the FO standard.



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