Here are some example WP All Import [IF] statements. The criteria for an IF statment is written in XPath 1.0 syntax and can use XPath functions. Although powerful, XPath syntax can be quite complex. In many cases it might be easier to use a PHP function as shown here.
The [ELSE]<something>
part is optional
[IF({price[.=0]})]Zero[ELSE]Not Zero[ENDIF]