tbd. Thorsten Letschert

An expression is an operation that evaluates its value, it is a combination of one or more constants, variables, functions, and operators that return another value.


3 + 4 
#Is an expression which evaluates to 7, with 3 and 4 being two constants 


4 ≠ 4
#This expression evaluates to false


An expression basically contains of one or more of these elements:

  • Field codes
  • Operators
  • Functions

Field codes are the heart.... and return different data types

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Ultimately, what can be used in an expression depends on the parsing mode-→


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