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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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