CORBA35 — Some explicit semantics seem to be missing in section5.8.6

Summary: Section 5.8.6 gives the BNF for the GIOP encoding of values but does not
describe the semantics behind them. Some of the semantics are referred
to in earlier section and intuitive for an outsider with a little CORBA
experience. Some of the the explicit semantics seem to be missing
altogether (e.g. the "" in <end_tag>). It would be useful if the
descriptions explicitly used the names within the BNF grammar or
explicit specifications for each name in the grammar was given.