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Hi Jaap,

At 21:21 7-2-2012, Jaap van de Putte wrote:
Hi Christophe,

My answers are below, between your questions :)

Op 7-2-2012 14:56, Christophe Strobbe schreef:
> Jaap,
> At 18:09 4-2-2012, Jaap van de Putte wrote:
>> (...) For now the
>> possibilities of LibreOffice in exporting a file are sufficient: you
>> have to export it to PDF/A-1a. In the near futere it will be
>> necessary to use a new subversion of PDF, PDF/UA (Universal
>> Accessibility). PDF/UA is more accessible than PDF/A-1a. More about
>> this format you can read on <>.
>> I am curious if new versions of LibreOffice will make it possible to
>> export files to PDF/UA. If LibreOffice is going to support this
>> format, it will make a huge difference when LibreOffice is compared
>> to other office suites.  And it wil be must easier to promote
>> LibreOffice to be used by government organizations.
> I agree this would be nice :-)
> I found your enhancement request at
> <>

I took the liberty to give it a fuller title (so it is clearer when you search bugs) and changed it to an enhancement request. I hope that's OK :-)

and I have a few
> questions:
> 1) Last year, I filed an enhancement request to enable tagged PDF by
> default: <>. If
> LibreOffice adds PDF/UA support, do you think it should be enabled by
> default?

Personally I shouldn't prefer this, because approximately 95 % of PDFs do not have a proper heading organization or is not elsewhere optimized for accessibility. Choosing a PDF format that includes the structure of a document that hasn't have any structure in the source seems a bit useless ... And in that case it makes the PDF file unnecessary larger.

Before submitting my bug about enabling tagged PDF by default, I asked for opinions on this list, and one of the original developers said that it was originally not enabled because of file size, but that this may no longer be an important counter-argument.
I don't know how PDF/UA impacts the size of PDF files.

> 2) In the PDF Options dialog box, should "PDF/UA" replace the current
> "PDF/A-1a" or should it be an additional checkbox?

PDF/A-1a is also used for archive, id est that is the default function of A-1. I am no expert, but I should say that A-1a should be possible too. So PDF/UA would be an extra checkbox. But I think this should be questioned to some experts.

Apparently, I temporarily forget that the A in PDF/A (ISO 19005-1:2005) stands for archiving instead of accessibility :-/
Anyway, checking PDF/A-1a leads to a few specific UI changes:
1. The "Tagged PDF" checkbox is checked (if it was not already checked) and greyed out.
2. The "Create PDF form" checkbox is unchecked and greyed out.
3. The "Embed standard fonts" checkbox is checked and greyed out.

If PDF/UA is added as a checkbox above or below PDF/A-1a, should the "Tagged PDF" checkbox also get checked and greyed out? Are there any other things that should happen? (I suppose I could ask Duff Johnson directly.)

> 3) If the user checks "PDF/UA" or "tagged PDF", should LibreOffice
> warn the user about accessibility issues in the source document?
> (There is an accessibility checker for Writer, but it is currently
> only available as an extension: [shameless plug]
> <>. It may be submitted to
> LibreOffice, but it is in Java, while LibreOffice wants to reduce its
> dependence on Java.)

I think that would be great. For a lot of people it is too much to install an extension. Does LibreOffice want to use Python in stead of Java? Than, could the extension be rewritten in Python? Of course this would need volunteers ... and I am not a programmer :(

Indeed this would require volunteers. Rewriting it in C++ (and integrating it into LibO instead of keeping it as an extension) would also be nice :-)

Best regards,


Christophe Strobbe
K.U.Leuven - Dept. of Electrical Engineering - SCD
Research Group on Document Architectures
Kasteelpark Arenberg 10 bus 2442
B-3001 Leuven-Heverlee
tel: +32 16 32 85 51
Twitter: @RabelaisA11y
Open source for accessibility: results from the AEGIS project
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