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https://issues.apache.org/jira/browse/FOP-2409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14123762#comment-14123762
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Glenn Adams commented on FOP-2409:
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The basic problem is that you got to clever with xml:lang when you set it to
"ar_SA" instead of just "ar", or leave out entirely. At present, FOP does an
exact match from a specified xml:lang to the font's tables, which are indexed
by the tuple <feature, script, language>, and none of the fonts had a table
matching a language of "ar_SA". Note that you really should use the XSL-FO
"language" attribute/property, and not xml:lang. See [1] for more info.
However, even after fixing this, it turns out there is still a bug being
tickled by this input related to <fo:page-number/> within a sequence of BIDI
text. You would notice this if you had assertions enabled. I have created Issue
FOP-2410 to track this problem.
Finally, I see you specified writing-mode="rl" on fo:root; however, it is not
significant on fo:root, but is significant on fo:page-sequence. See [1] for
further info.
[1]
http://xmlgraphics.apache.org/fop/trunk/complexscripts.html#language_property
[2]
http://xmlgraphics.apache.org/fop/trunk/complexscripts.html#writing_mode_property
> Arabic characters mess up on PDF
> --------------------------------
>
> Key: FOP-2409
> URL: https://issues.apache.org/jira/browse/FOP-2409
> Project: Fop
> Issue Type: Bug
> Affects Versions: trunk
> Environment: DITA-OT 1.8.4 (partially patched)
> FOP from trunk (07/18/2014)
> Reporter: Red Shen
> Attachments: basic_connector_instructions.xml, fop.pdf, topic.fo,
> xep.pdf
>
>
> I don't understand Arabic. But just go look at the PDF output from FOP and
> XEP, the title text looks different. The XEP one should be correct.
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