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https://issues.apache.org/jira/browse/FOP-2728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16091564#comment-16091564
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Jennifer Hodgdon commented on FOP-2728:
---------------------------------------

One other note. The standard DocBook XSLT for converting DocBook to FO XML puts 
the language attribute on both the fo:root element and in fo:page-sequence 
elements, and possibly elsewhere. I had to remove it from all places from our 
actual intermediate FO file, in order to get the font working correctly.

So it is not as simple as overriding just one XSLT template. You have to 
override many many templates, unfortunately. This is really not a viable 
solution for us, as we don't want to have this many customized templates to 
maintain. I am instead going to either (a) wait for this issue to be fixed or 
(b) try a non-FOP method for building PDF files from DocBook, at least for 
Farsi.


> Persian (Farsi) output problem with FOP
> ---------------------------------------
>
>                 Key: FOP-2728
>                 URL: https://issues.apache.org/jira/browse/FOP-2728
>             Project: FOP
>          Issue Type: Bug
>          Components: renderer/pdf
>    Affects Versions: 2.1
>         Environment: Ubuntu 16.04 with xmlto 0.0.28
>            Reporter: Navid Emami
>              Labels: drupal
>             Fix For: 2.1
>
>         Attachments: mkebooks.sh, pdf-farsi.xsl, sample-output-final.zip, 
> sample-output.zip, simple.fo, simple-nolang.pdf, simple.pdf
>
>
> We are having trouble making Persian (Farsi) language output with FOP.
> We are using the *xmlto* script with the --with-fop option to convert a 
> DocBook file to PDF using FOP, which uses XSLT to first make a FO file, and 
> then FOP to convert to PDF. We used the --noclean option to capture the 
> intermediate FO XML file.
> We have verified that the Persian (Farsi) characters are readable in the 
> DocBook and FO files. However, when we generate the PDF, the output is not 
> readable. There are both _joined_ and _separated_ letters in Persian (Farsi) 
> language but the output in PDF format has just separated ones.
> Note that there are some font issues in the PDF output as well -- missing 
> glyphs -- those show as # characters, and are in the chapter/section 
> headings. However, the main body of the text has no # characters, and it 
> still has this problem.
> *Attachments:*
> * sample-output.zip contains small.docbook, small.fo, small.epub and 
> small.pdf. The final output of PDF should be similar to EPUB.
> * sample-output-full.zip contains guide.epub and guide.pdf which are the 
> complete documents but with wrong rendering of characters in PDF.



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