-FIXME localizers are to allow mir installations to add code seperate from the
-main code. A lot of things can be changed in an installation (and are
-by various mir sites). Think of custom open posting mechanism, open
-posting validation, data model enhancements.
+Localizers provide a customization framework that allows
+different mir sites to behave differently. Each site can
+write it's own bits of java code that override default behavior.
+This is effectively
+used by various indymedia sites to customize things
+such open posting mechanisms, open
+posting validation, data model enhancements, etc.
+</para>
+<para>
+The <classname>MirLocalizer</classname> interface describes
+the centralized localizer, that may be accessed via the global
+<function>MirGlobal.localizer()</function>
+function. The central localizer provides accessors to
+domain specific localizers
+(like <classname>MirBasicOpenPostingLocalizer</classname>).
+</para>
+<para>
+Default behavior is provided by the <classname>MirBasicLocalizer</classname>
+and it's associated classes. These classes can be extended to
+override default behavior.