Reserved Keywords
The following keywords are reserved by the language and cannot be used as identifiers:
The Data Context: Data
Variable Declaration: var
Type Names: number, string, boolean, object, array
Control Flow: if, then, else, end, switch, case, default, return
Iteration: foreach, in, do, while, break, continue
Logical Operators: and, or, not
Type Checking: is
Literals: true, false, null