Eelement names

[Yves Savourel <ysavourel@enlaso.com>]

Hi everyone,

While <metadata> all lowercase is fine (because it's an actual word), based on our naming convention <mda:metagroup> should be
<mda:metaGroup>, like <res:resourceData> for example.

(I also wonder why we didn't simply use <mda:group> as it's in a different namespace...
Or why we use <mda:meta> instead of <mda:data>... but never mind).

In the same vein:

<gls:glossentry> should be <gls:glossEntry> (or better: <gls:entry>).

At this point I don't really care if we change or not any of those, but keep in mind that is the last chance to get them right and
consistent (if we think they are wrong).

Cheers,
-yves