Translations:Expression Manager - presentation/138/en

The Expression Manager supports the following syntax:
 * All standard mathematical operators (e.g. +,-,*,/,!);
 * All standard comparison operators (e.g. <,<=,==,!=,>,>=, plus their equivalents: lt, le, eq, ne, gt, ge);
 * Parentheses (so you can group sub-expressions);
 * Conditional operators (e.g. &&,| | and their 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., the SGQA codes;
 * Pre-defined functions (there are already 80+, and it is easy to add more).