Built-ins

ISO 10303-11 tables 4 and 5 list built-in functions and procedures. ExpressLexer recognises them as Name.Builtin only in call position (a ( may follow), which is what the (?=\s*\() lookahead enforces. Each call below must therefore highlight the routine name as a built-in.

Built-in functions (table 4)

built-in functions

ABS(x)
ACOS(x)
ASIN(x)
ATAN(x)
BLENGTH(b)
COS(x)
EXISTS(x)
EXP(x)
FORMAT(x, y)
HIBOUND(x)
HIINDEX(x)
LENGTH(x)
LOBOUND(x)
LOG(x)
LOG2(x)
LOG10(x)
LOINDEX(x)
NVL(x, y)
ODD(x)
ROLESOF(x)
SIN(x)
SIZEOF(x)
SQRT(x)
TAN(x)
TYPEOF(x)
USEDIN(x)
VALUE(x)
VALUE_IN(x, y)
VALUE_UNIQUE(x)

Built-in procedures (table 5)

built-in procedures

INSERT(list, i, x);
REMOVE(list, i);

A schema that puts several of them to work:

built-ins in context

ENTITY builtin_probe;
  WHERE
    wr1 : SIZEOF(USEDIN(SELF, 'POINT')) > 0;
    wr2 : EXISTS(SELF) AND TYPEOF(SELF) <> UNKNOWN;
    wr3 : HIBOUND(coords) - LOBOUND(coords) = LENGTH(coords) - 1;
END_ENTITY;

SIZEOF on its own — without the call parenthesis — is a plain identifier, not a built-in:

not a built-in without the call

SIZEOF            -- Name, not Name.Builtin
SIZEOF (x)        -- Name.Builtin followed by Whitespace then (