[HTTPS-Everywhere] RELAX NG vs trivial-validate?

[Jacob S Hoffman-Andrews]

I've been tweaking trivial-validate.py and noticed that we also do 
validation using RELAX NG, and XML schema that allows you to specify 
the format of other XML docs. Is there a distinction between which 
validations we express in RELAX NG vs which ones we express in 
trivial-validate.py? For instance, many of the validations in 
trivial-validate.py can be expressed using RELAX NG's pattern 
facility. It would be a little bit nice to consolidate on one or the 
other to speed up the makexpi process.

Also, out of curiosity, why does the set of valid parameters for a 
target host include ä and ö, but not the full range of URL-valid 
Unicode characters?

     <oneOrMore>

       <element name="target">

         <attribute name="host">

           <data type="string">

             <param name="pattern">(([A-Za-z0-9äö-]+|\*)\.)*([A-Za-z0-9äö-]+|\*)</param>

           </data>

         </attribute>

       </element>

     </oneOrMore>