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https://issues.apache.org/jira/browse/FOP-2520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14713551#comment-14713551
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Björn Kautler commented on FOP-2520:
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Ah, thanks for your help guys.
Actually it is the preprocessing of the file.
The profiling step we do before the DocBook->FOP for making the Doku customer-
and build-specific actually inserts newlines between the <indexterm>s, so the
input DocBook for the DocBook XSL is
{noformat}
<para>
<indexterm significance="normal">
<primary>table</primary>
<secondary>customize columns</secondary>
</indexterm>
<indexterm significance="normal">
<primary>customize</primary>
<secondary>table</secondary>
</indexterm>
<indexterm significance="normal">
<primary>filter</primary>
<secondary>table</secondary>
</indexterm>
<indexterm significance="normal">
<primary>table</primary>
<secondary>filter</secondary>
</indexterm>You can customize most tables in the product. The
configured table view is saved in your user profile and will be restored when
you start the prouct the next time.</para>
{noformat}
I'll try to find out whether I can prevent this.
But still I wonder why it does not work even with that input and why it works
fine with XEP.
> Empty elements consume space
> ----------------------------
>
> Key: FOP-2520
> URL: https://issues.apache.org/jira/browse/FOP-2520
> Project: FOP
> Issue Type: Bug
> Affects Versions: 2.0
> Reporter: Björn Kautler
> Attachments: empty space that should not be there.png
>
>
> If you use {{indexterm}} tags in DocBook, the DocBook XSL stylesheets
> generate empty {{fo:wrapper}} or {{fo:block}} elements with an {{id}}
> attribute. These elements take up visible space if processed with FOP. Using
> XEP, those empty tags do not consume any space.
> Here an example excerpt from a FO file in question and [attached|^empty space
> that should not be there.png] the result.
> {code:xml}
> <fo:block space-before.optimum="0.6em" space-before.minimum="0.4em"
> space-before.maximum="0.8em">
> <fo:wrapper id="N1004F"><!--table, customize columns--></fo:wrapper>
> <fo:wrapper id="N10056"><!--customize, table--></fo:wrapper>
> <fo:wrapper id="N1005D"><!--filter, table--></fo:wrapper>
> <fo:wrapper id="N10064"><!--table, filter--></fo:wrapper>You can customize
> most tables in the product. The configured table view is saved in your user
> profile and will be restored when you start the prouct the next time.
> </fo:block>
> {code}
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