Translations:Expression Manager/138/en

Expression Manager supports the following syntax:
 * All standard mathematical operators (e.g. +,-,*,/,!)
 * All standard comparison operators (e.g. <,<=,==,!=,>,>=, plus these equivalents:  lt,le,eq,ne,gt,ge)
 * Parentheses (so you can group sub-expressions)
 * Conditional operators (e.g. &&,| | and these equivalents: and,or)
 * Single and double-quoted strings (which can each embed strings with the other quote type)
 * Comma operator (so can have a list of expressions and just return the final result)
 * Assignment operator (=)
 * Pre-defined variables (to refer to questions, question attributes, and responses) - e.g. all of the SGQA codes
 * Pre-defined functions (there are already 70+, and it is easy to add more)