XLIFF 2.0 Comments - 2.7.1 Extension Points

Is there a concrete reason why <file>, <group>, and <unit> can contain element-based extensions, but <segment> and <ignorable> can’t, especially when those elements already contain modules? Not allowing extensions
 here means that no one could create an extension that could potentially become another module at <segment> or <ignorable> level like those already defined.

 

Additionally, is there a concrete reason why <mda:metadata> is allowed only in <mtc:matches> and no other modules in the spec? (BTW, there’s a typo in the list, it currently says <mtc:match> and not <mtc:matches).

 

Thanks,

Ryan