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https://issues.apache.org/jira/browse/FOP-2520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Björn Kautler updated FOP-2520:
-------------------------------
    Description: 
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}

  was:
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:

{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}


> 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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