anchor.diff:  *Subject Type*: [.subject .subjectless]#Subjectless, Number or Decimal (depending on the desired method to run)#
   
   *Arguments*:
  +
   	- [.argName]#_Method_# : [.argDesc]#The name of the Java Math method to run#
   	- [.argName]#_Optional Argument_# : [.argDesc]#Optional argument that acts as the second parameter to the method.#
   
  
positive.code: 
  Often times, we will need to compare the values of two different attributes to each other.
  We are able to accomplish this by using embedded Expressions. We can, for example, check if
  the ``filename'' attribute is the same as the ``uuid'' attribute: `${filename:equals( ${uuid} )}`.
  Notice here, also, that we have a space between the opening parenthesis for the `equals` method and
  the embedded Expression. This is not necessary and does not affect how the Expression is evaluated
  in any way. Rather, it is intended to make the Expression easier to read. White space is ignored by
  
negative.code: functions that can be chained together.
  
  Any FlowFile attribute can be referenced using the Expression Language. However, if the attribute
  name contains a "special character", the attribute name must be escaped by quoting it. The following
  characters are each considered "special characters":
  
  - $ (dollar sign)
  - | (pipe)
  