Syntax

  @EvaluateExpression([ATTR_CREATE_EXPR|ATTR_SET_EXPR], <retValType>, <wwjd attrname>, <wwjd expr>, [<wwjd attrname>, <wwjd expr>,]* <transformername>, [NullAttrMode], [NullAttrReplacementValue], [maxFeatureWindowSize])

  @EvaluateExpression([ATTR_CREATE_EXPR_TYPED|ATTR_SET_EXPR_TYPED], <retValType>, <wwjd attrname>, <wwjd expr>, <result type>, [<wwjd attrname>, <wwjd expr>, <result type>,]* <transformername>, [NullAttrMode], [NullAttrReplacementValue], [maxFeatureWindowSize])

  @EvaluateExpression([ATTR_CREATE_EXPR_<suffix>|ATTR_SET_EXPR_<suffix>], <wwjd attrname>, <wwjd expr>, [<wwjd attrname>, <wwjd expr>,]* <transformername>, [NullAttrMode], [NullAttrReplacementValue], [maxFeatureWindowSize])

  @EvaluateExpression([ATTR_CREATE_EXPR_TYPED_<suffix>|ATTR_SET_EXPR_TYPED_<suffix>], <wwjd attrname>, <wwjd expr>, <result type>, [<wwjd attrname>, <wwjd expr>, <result type>,]* <transformername>, [NullAttrMode], [NullAttrReplacementValue], [maxFeatureWindowSize])

  @EvaluateExpression(<retValType>, <wwjd expr>, <transformername>)
   
  @EvaluateExpression(<retValType>, <wwjd expr>, <transformername>)

  @EvaluateExpression(DIV, <retValType>, <wwjd expr>, <transformername>)

Arguments
   ATTR_CREATE_EXPR - specifies the expression should create a new attribute or set an existing attribute
      with the result of the expression.
   ATTR_SET_EXPR - specifies the functions should set an existing attribute only.  If the attribute already
      exists, it will fail.

   _PROPAGATE_MISSING: if you append this to either ATTR_CREATE_EXPR or ATTR_SET_EXPR, then the expression will
      not create any attribute if the expression is an @Value(attr) where attr does not exist on the input feature

   _TYPED: if you append this to either ATTR_CREATE_EXPR or ATTR_SET_EXPR then the attribute will be output with the 
      specified type.  See retValType for a list of valid types.

   _DIV: if you append this to either ATTR_CREATE_EXPR or ATTR_SET_EXPR, then the expression will evaluate any / using
      float rather than integer division

    _MULTI_FEATURE: indicates there are 3 additional parameters after the transformer name.  
            NullAttrMode: 
               NO_OP - if value is null, missing or empty value, just use that value
               CLOSEST_2 - if find null, missing or empty, look for the closest feature with a value. If no closest found, use NullAttrReplacementValue
               OTHER_NULL_VALUE_2 - if find null, missing or empty, replace this value with NullAttrReplacementValue
            NullAttrReplacementValue: The value to use if a null, missing or empty is found.  This is only
               valid in the case of CLOSEST_2 and OTHER_NULL_VALUE_2
            MaxFeatureWindowSize - how many prior/post to look when doing closest feature analysis
   <retValType> | <result type>
  The type of output the expression should try return.  Valid values are: FLOAT, INT, STRING, STRING_ENCODED, UTF8, UTF16.

   <wwjd attrname> 
      The name of the attribute to set with the result of wwjd expr

   <wwjd expr>
      The expression to evaluate.

   <transformername>
      The name of the transformer.  this name will be added to any log messages and can help the user tell where in the workspace the 
      expression causing the logged message is located.

Description

   Evaluates an expression and either sets an attribute to the result or returns the result depending on the mode.
   If you have multiple attributes to set, calling this function once with a list will be faster than call it multiple
   times because results of the expressions can be cached.