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| Expressions and operators | |||||
An expression is simply a value that can be used in a computation. OmniMark has three kinds of expressions: numeric, string, and test.
An expression can be as simple as a quoted string, a number or a variable name. More complex expressions can be built up from these by using operators. An operator is a keyword or a phrase that uses one or more values (or "operands") to calculate a new value. Parentheses can be used to surround the subexpressions within an expression to clarify which subexpressions are operands to particular operators.
Whenever possible, OmniMark will evaluate an expression at compile time. Compile-time expressions can be used wherever a constant numeric or string expression is required. There are some contexts in which only compile-time expressions can be used.
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