too many prefixes: remove per-profile prefixes

[VladimirAlexiev]

Here are all prefixes I can find across CGMES and NC. I've listed them in this order:
CIM/CGMES/NC/model/header/meta, CGMES profiles, NC profiles, other (standard prefixes).

  --prefixOrder cim		\
  --prefixOrder nc		\
  --prefixOrder cims		\
  --prefixOrder dcat-cim	\
  --prefixOrder dm		\
  --prefixOrder eu		\
  --prefixOrder eumd		\
  --prefixOrder md		\
  --prefixOrder prof		\
  --prefixOrder profcim		\
				\
  --prefixOrder dh		\
  --prefixOrder dl		\
  --prefixOrder dy		\
  --prefixOrder eq		\
  --prefixOrder eqbd		\
  --prefixOrder gl		\
  --prefixOrder op		\
  --prefixOrder sc		\
  --prefixOrder ssh		\
  --prefixOrder sv		\
  --prefixOrder tp		\
				\
  --prefixOrder ae		\
  --prefixOrder as		\
  --prefixOrder co		\
  --prefixOrder er		\
  --prefixOrder gd		\
  --prefixOrder iam		\
  --prefixOrder ma		\
  --prefixOrder or		\
  --prefixOrder ps		\
  --prefixOrder psp		\
  --prefixOrder ra		\
  --prefixOrder ras		\
  --prefixOrder sar		\
  --prefixOrder sm		\
  --prefixOrder sis		\
  --prefixOrder shs		\
  --prefixOrder ssi		\
				\
  --prefixOrder dcat		\
  --prefixOrder dct		\
  --prefixOrder euvoc		\
  --prefixOrder owl		\
  --prefixOrder prov		\
  --prefixOrder rdf		\
  --prefixOrder rdfs		\
  --prefixOrder sh		\
  --prefixOrder skos		\
  --prefixOrder xsd

As you see, you use about 4x more prefixes than the standard ones.
Also, you hog short 2-3 letter prefixes.
There's no conflict with the standard ones (dct, sh) maybe by pure luck.

Happily, you don't use the profile prefixes (group 2 and 3) on terms (classes, props, individuals).
(If you had done that, you'd drive your users crazy.)
I'd guess that not even standards creators can say what is psp or sis without consulting some files.

You use profile prefixes for a couple of things, eg:

psp:Ontology a owl:Ontology ;
  dcterms:description "This vocabulary is describing the power system profile."@en ;
  dcterms:title "Power System Project Vocabulary"@en ;
psp:Package_PowerSystemProjectProfile a cims:ClassCategory

But there's no need to consume a prefix just for that.

My strong recommendation is to remove profile prefixes.