Turtle-like alternative concise concrete syntax for OML

[NicolasRouquette]

Currently, the OML concrete syntax involves a lot of repetition.

For example:

open terminology <http://example.org/foo> {
  ...
  concept A
  A extendsConcept B
  A extendsConcept C
  A extendsConcept D
}

A Turtle-like syntax could help avoid repeating the concept like this:

open terminology <http://example.org/foo> {
  ...
  concept A [
    extendsConcept B
    extendsConcept C
    extendsConcept D
  ]
}

Note that it is important to retain the possibility of both syntaxes since OML statements can be asserted individually; for example:

open terminology <http://example.org/foo> {
  ...
  concept A [
    extendsConcept B
    extendsConcept C
  ]
}

open terminology <http://example.org/bar> {
  extends <http://example.org/foo>
  A extendsConcept D
}