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A large collection of predefined functions exist that provide access to the
machine being debugged, as well as those which perform various operations on
values of the data types supported by System Debug.
Syntactically, a function reference appears as an operand in an expression and
is denoted by its name, followed optionally by a list of parameters surrounded
by parentheses. Multiple parameters are separated from one another by either
spaces or commas. Functions evaluate to a single value of some type.
Detailed descriptions of all the System Debug predefined functions
may be found in chapter 8.
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