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https://issues.apache.org/jira/browse/FOP-1760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402706#comment-15402706
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Jan Tošovský commented on FOP-1760:
-----------------------------------

The current patch produces invalid intermediate format. All changebars are 
rendered as absolute positioned blocks even if the parent areas are inline 
objects. Without improvements of IF (a new element?) there is no way to compile 
FOP because of failing tests.

> [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, 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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