Differences

This shows you the differences between two versions of the page.

--- syntax:start [2015/06/03 23:31] – dmitry
+++ syntax:start [2020/04/28 09:26] – dmitry
@@ Line 17: / Line 17: @@
 === Parameters ===
 An expression can refer to [[parameters:|project parameters]] that are evaluated to text or number constants prior to calculating the expression. Parameter names in expressions are wrapped in curly brackets and are case-sensitive. E.g. {File name}, {Ratio}.
+=== Comments ===
+Expressions can be annotated (commented). Any text between a double-slash (%%//%%) and the end of line is considered a comment and is ignored during expression evaluation. A comment can't span several lines. Example:
+<code>
+//Converted amount.
+[Amount] * {FX Rate}  // Using a parameter for the exchange rate.
+</code>
 === Example 1 ===
@@ Line 45: / Line 54: @@
 |  QC  |    	2000|	270|
-=== Transformations that use expressions ===
+=== A few transformations that use expressions ===
   * [[transformations:addcolumn|Calculate new columns]]
   * [[transformations:replacecolumn|Calculate and replace columns]]
@@ Line 51: / Line 61: @@
   * [[transformations:filter|Filter by condition]]
   * [[transformations:trimbycondition|Trim by condition]]
+  * [[transformations:halt|Halt on condition]]