Mathjax-v2.2-feature-discussion.md

 ### Localization
 
-See [[MathJax v2.x potential feature: localization]]
+For the full requirements and discussion, see [[MathJax v2.x potential feature: localization]]
+
+Let's try to boil down how far we can address the requirements in v2.2
+
+* How does MathJax decide which language to use?
+     * How much control should the author have?
+     * How much control should the visitor have?
+     * Can MathJax automatically decide the language?
+     * Can other software communicate preferences to MathJax (e.g., AT software, dynamic l11n code)?    
+     * What happens when the required language is not available?
+
+MathJax will have additional configuration options as well as cookie information on user preferences for locales. Storage and loading of locales will follow the model already in place for configuration files.
+
+The configuration options allows authors to specify a) what language is the default for a page b) if they want to activate a submenu so users switch languages (they can specify a subset of languages) c) if they want to forcibly override user preferences stored in the MathJax cookie.
+
+We will not attempt to auto-detect locales as this is currently not reliably possible with javascript.
+
+Since we want to allow authors to allow users to switch locales, an API will be needed to allow third parties to switch these as well (e.g., in a dynamic "change locale" situation of webcontent).
+
+English will be the fallback language.
+
+* **How do we guarantee availability of international characters?**
+     * How do we deal with non-roman languages?
+     * How do we deal with non-Arabic numerals?
+     * How do we deal with vertical writing?
+     * Do we allow style changes in translations (cf. HTML snippets)? (different language, different need)
+
+Eventually, we will add font-checking features, but for the initial implementation we will rely on system fonts with a wide unicode coverage.
+
+We will need to investigate non-Arabic numerals.
+
+Vertical writing will not be supported for now since vertical writing systems often have horizontal alternatives, e.g., [Asian scripts](https://en.wikipedia.org/wiki/Horizontal_and_vertical_writing_in_East_Asian_scripts).
+
+* Who makes the translation?
+     * Do we have enough complexity to need professional translations?
+     * how do we communicate to translators what needs to be translate?
+
+Internally, json seems to be the natural way to deal with the locale information. 
+
+Externally (for contributors), we will make sure to offer a file format that is compatible with crowd-sourced platforms such as [Translate Wiki](http://translatewiki.net/). The natural candidate is [XLIFF](https://en.wikipedia.org/wiki/XLIFF); alternative could be PO (common in php projects). For more inspiration see [this SO thread](http://stackoverflow.com/questions/2520891/any-collaborative-tool-website-to-localize-an-android-app).
+
+* **What languages should we deliver out of the box?**
+
+We will provide an initial set of translations as large as possible. French and German will be easy via the MathJax Team. The interest of the community (in particular, assuming help from Wikipedia and TranslateWiki) will help us provide a wide range of translations as soon as we've created the format and during the beta cycle.
+
+* **How should MathJax extensions be localized?**
+
+While an API for extensions will be part of a future release (and hence influence the defensive implementation for v2.2), this is outside the scope of v2.2.
+
+* Can we add translations without making a new release?
+     * Where can you find translations?
+     * Can you provide private translations?
+     * How do we encourage giving translation back?
+     * Do we allow alternative or additional translations? (say, redirect to tech support)
+     * Do we force CDN users to give their translations back?
+
+The implementation should allow adding translations on the fly. From a practical point of view, we can easily add translations to the latest branch and the CDN, following the vN.Ma release schema.
+
+Locale files will be part of the main MathJax repository but just like configuration files can be loaded from arbitrary locations. 
+
+We will encourage contributions by using webservices such as TranslateWiki.
+
+Technical considerations:
+
+* 1 file per language vs multiple files per language
+
+As with the idea of an API for extensions and their locales, MathJax will have to deal with multiple files eventually. The MathJax core locale should be small enough (<100 stringes) to fit in a single file without performance issues.
+
+* defensive programming aspects
+Apply to
+     * MathJax UI strings added in the future
+     * API for extensions and their locales
+     * security concerns with 3rd party translations
+       
 
 ### Fonts & Characters
 
@@ -8,6 +81,7 @@ See [[MathJax v2.x potential feature: localization]]
      * Create fontdata and webfonts
      * investigate potential for crowdsourcing fontdata generation
 * Investigate font mixing/switching, using document font for alpha-numeric characters.
+* Investigate [Deja Vu fonts](http://dejavu-fonts.org/wiki/Main_Page) (planned "MathML 2.0" support).
 
 ### TeX input enhancements