Definition: A + B

 This is a binary operator, for which the first of the ordered
 arguments is "left" of the operator and the second is "right".

 Definition: A / B

 This is a binary operator, for which the first of the ordered
 arguments is "left" of the operator and the second is "right".

 Definition: A % B

 This is a binary operator, for which the first of the ordered
 arguments is "left" of the operator and the second is "right".

 Definition: A * B

 This is a binary operator, for which the first of the ordered
 arguments is "left" of the operator and the second is "right".

 Definition: A - B

 This is a binary operator, for which the first of the ordered
 arguments is "left" of the operator and the second is "right".

 Definition: cosine(A)

 Definition: sine(A)

 Definition: tangent(A)

 Definition: arccosine(A)

 Definition: arcsine(A)

 Definition: arctangent(A)

 Definition: The square of arctangent(A)

 Definition: hypotenuse(A, B)

 Definition: /A/ : absolute value of "A"

 e^A

 ln(A) : natural logarithm of "A"

 log(A, B) : log, base "B" of "A"

 Definition: A^B : "A" raised to the "Bth" power

 sqrt(A)

 if (A > B) return A; else return B;

 if (A < B) return A; else return B;

 Definition: Not (the logical operator)

 Symbol: !A, where A is the operand

 Return Type: Boolean

 This unary logical operator treats an operand with a value
 of zero (0) as FALSE, while an operand with a non-zero
 value is treated as TRUE.

 Definition: And (the logical operator)

 Symbol: A && B, for operands A, B

 This binary logical operator treats its first ordered argument
 (A) as "left" of the operator, while the second (B) is "right".
 An operand with a value of zero (0) is treated as FALSE, while
 an operand with a non-zero value is treated as TRUE.

 A == B

 A > B

 A >= B

 A < B

 A <= B

 A != B

 Definition: Or (the logical operator)

 Symbol: A || B, for operands A, B

 This binary logical operator treats its first ordered argument
 (A) as "left" of the operator, while the second (B) is "right".
 An operand with a value of zero (0) is treated as FALSE, while
 an operand with a non-zero value is treated as TRUE.

 Definition: Exclusive Or (the logical operator)

 Symbol: A ?? B, for operands A, B

 This binary logical operator treats its first ordered argument
 (A) as "left" of the operator, while the second (B) is "right".
 An operand with a value of zero (0) is treated as FALSE, while
 an operand with a non-zero value is treated as TRUE.

 Definition: if (A) return B; else return C

 Accepts exactly 3 arguments: A, B, and C.

 The mathematical constant PI

 This specifies the Boolean constant TRUE.
 The use of this predefined function is deprecated;
 instead, use an appropriate <Literal> instance.

 This specifies the Boolean constant FALSE.
 The use of this predefined function is deprecated;
 instead, use an appropriate <Literal> instance.

 Returns time, in floating point seconds, since
 00:00:00 UTC, January 1, 1970.

 Returns time, in floating point seconds, since 00:00:00, January 1,
 1970 in the time zone containing latitude=A longitude=B (degrees).

 Returns time, in floating point seconds, since simulation start.

 Returns time, in unsigned microseconds, since simulation start.
 The value is allowed to overflow and roll back to zero.

 Returns the height of the terrain at the point specified by the
 arguments.  Arguments are interpreted as coordinates within the currently
 scoped spatial reference frame defined by the current transmittal.
 Argument order should match the field order defined by <Location 3D>.

 Returns a cycling time value in seconds of the kind specified by the
 arguments. These arguments are:
 A - a trigger boolean to start the cycle(s)
 B - cycle length in seconds
 C - a function that returns time in seconds (e.g. SE_FUNC_SIM_GMT)
 D - number of cycles to do before stopping
 E - cycle time at which to start
 F - cycle time at which to end
 G - Boolean specifying whether the cycle runs one way
     (e.g. start > end, start > end) or whether it reverses at the end
     (e.g. start > end > start)

 Returns simulation Time of Day in hours and fractions of hours.

 Returns simulation Time of Year in days since January 1st.

 This predefined function returns the simulation wind direction in
 degrees, measured anti-clockwise from geodetic north. Its use is
 deprecated; instead, use a <Variable> instance with meaning set to
 EAC_WIND_DIRECTION.

 This predefined function returns the simulation wind speed in
 metres per second (m/s). Its use is deprecated; instead, use
 a <Variable> instance with meaning set to EAC_WIND_SPEED.

 Returns simulation relative humidity in range 0-1.

 This predefined function returns the simulation precipitation rate
 in centimetres per hour. Its use is deprecated; instead, use
 a <Variable> instance with meaning set to EAC_PRECIPITATION_RATE.

 This predefined function returns the simulation temperature
 in degrees Celsius. Its use is deprecated; instead, use
 a <Variable> instance with meaning set to EAC_AIR_TEMPERATURE
 (or if another temperature quantity is desired, the appropriate
 EA for that quantity).

 Returns simulation sun direction in degrees, measured anti-clockwise
 from geodetic north.

 Returns simulation sun elevation, in degrees above horizon.

 This is used to allow a <Property Table> to drive a <Control Link>.

 Contains a <Property Table Reference> as an argument, which references
 the <Data Table> (usually, this will be a <Property Table>). The values
 should be stored in cells with a <Property> that is defined by the
 EDCS Attribute Code (EAC) of the type appropriate for the target
 <Control Link> that is to be driven.

 This <Predefined Function> is contained by the target <Control Link>,
 and thereby returns the value referenced from the <Property Table> as
 the value that drives the target <Control Link>. The <Property Table
 Reference> can itself be controlled using a <Property Table Reference
 Control Link>, allowing different values to be referenced from the
 <Property Table>.