[libreoffice-accessibility] Default language of hyperlinks

Hi,

When you create a hyperlink in a Writer document (LibreOffice or 
OpenOffce.org), the language is explicitly set to "zxx" by default 
(this is shown in the statusbar as "[None]"). In order to identify 
the language of a hyperlink, you need to explicitly set it by 
selecting the link and picking a language.

The cause seems to be a default in Writer. When you unpack an ODT 
file and inspect the file "styles.xml", you will find the following lines:

  <style:style style:name="Internet_20_link" 
style:display-name="Internet link" style:family="text">
   <style:text-properties fo:color="#000080" fo:language="zxx" 
fo:country="none" style:text-underline-style="solid" 
style:text-underline-width="auto" 
style:text-underline-color="font-color" style:language-asian="zxx" 
style:country-asian="none" style:language-complex="zxx" 
style:country-complex="none"/>
  </style:style>

The relevant attributes here are
* fo:language="zxx" fo:country="none"
* style:language-asian="zxx" style:country-asian="none"
* style:language-complex="zxx" style:country-complex="none"

It is unclear to me why these defaults exist. I could not find 
anything in the ODF 1.2 specification that justifies their existence.
Some background from that specification (notably section 16.2<style:style>):

"Styles defined by the <style:style> element use a hierarchical style 
model. The <style:style> element supports inheritance of formatting 
properties by a style from its parent style. A parent style is 
specified by the style:parent-style-name attribute on a <style:style> element."

(Note that the style:style element for hyperlinks does not have a 
style:parent-style-name attribute.)

"For styles with family text which are applied to elements which are 
contained in another element that specifies a style with family text, 
the search continues within the text style that is applied to the 
nearest ancestor element that specifies a style with family text, and 
continues in its parent styles."

Based on this I would expect hyperlinks to inherit language 
properties from the paragraph within which it is contained. In my 
test document, they would inherit
* fo:language="en" fo:country="GB"
* style:language-asian="zh" style:country-asian="CN"
* style:language-complex="ar" style:country-complex="SA"
(I always enable East-Asian and CTL in Writer, and set the default 
language for Asian languages to "Chinese (simplified)".)
However, the default hyperlink styles appear to prevent this.

Authors usually forget to set the language of hyperlinks, so I would 
be in favour of removing the defaults that set the language of 
hyperlink text to "zxx" / "[None]".

Best regards,

Christophe


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