Syntax:
pragma Global (GLOBAL_SPECIFICATION);
GLOBAL_SPECIFICATION ::=
     null
  | (GLOBAL_LIST)
  | (MODED_GLOBAL_LIST {, MODED_GLOBAL_LIST})
MODED_GLOBAL_LIST ::= MODE_SELECTOR => GLOBAL_LIST
MODE_SELECTOR ::= In_Out | Input | Output | Proof_In
GLOBAL_LIST   ::= GLOBAL_ITEM | (GLOBAL_ITEM {, GLOBAL_ITEM})
GLOBAL_ITEM   ::= NAME
For the semantics of this pragma, see the entry for aspect Global in the
SPARK 2014 Reference Manual, section 6.1.4.