expression

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 This is the expression node.  It takes an arbitrary list of doubles
 as input and performs any legal MEL expression on them to generate
 a list of double outputs.

 Caution:  Use of the 'setAttr' or 'getAttr' statements from within
           an expression node can have unexpected results.  Using
           these statements bypasses the normal dependency graph
           evaluation mechanism and may cause incorrect or incomplete
           evaluation.

animCurve, animCurveUT, animCurveUU, animCurveUA, animCurveTT, animCurveTU, animCurveUL, resultCurve, resultCurveTimeToLinear, resultCurveTimeToTime, resultCurveTimeToUnitless, resultCurveTimeToAngular, animCurveTA, animCurveTL, animBlend, animBlendInOut

animated, attribute, evaluateNow, exprConnCount, expression, frame, input, internalExpression, lastTimeEvaluated, newFileFormat, object, objectMsg, output, time, unitOption

Long name (short name)	Type	Default	Flags
input (in)	double	0.0
This is the multi that holds the connection as input into the expression.
output (out)	double	0.0
This is the multi that holds the connection as output of the expression.
object (ob)	string	NULL
Default object for attribute names in expression.
attribute (a)	string	NULL
Default attribute if no lvalue in expression
expression (e)	string	NULL
Evaluated value of the expression
exprConnCount (xcc)	integer	0
number of input and output connections for expressions
internalExpression (ixp)	string	NULL
This is the internal representation for the expression.
time (tim)	time	0film
This holds the value for time to be queried in seconds.
frame (frm)	time	0film
This holds the value for time to be queried in frames.
lastTimeEvaluated (lte)	time	0film
The last time that this expression was evaluated.
evaluateNow (xen)	short	0
This attribute depends on aTime. Dirtying aTime and asking for this will force evaluation.
animated (ani)	enum	1
This attribute tells whether or not the expression node was forced to be "animated" from the expression command. Records the unit conversion option used to create/edit this expression.
newFileFormat (nff)	short	0
Obsolete.
objectMsg (obm)	Message	n/a
Identifies the default object.
unitOption (uno)	enum	0
Records the unit conversion option used to create/edit this expression.