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.
Note: The [ELSE]<something>
part is optional
[IF({price[.=0]})]Zero[ELSE]Not Zero[ENDIF]
[IF({price[.>0]})]Greater than 0[ENDIF]
[IF({title[.='Foo']})]The title is Foo[ENDIF]
[IF({title[.!='Foo']})]The title is not Foo[ENDIF]
[IF({title[.='']})]The title is empty[ENDIF]
[IF({title[contains(.,’Foo')]})]Has foo[ENDIF]
[IF({title[string-length()>10]})]{title}[ENDIF]
[IF({title[.='']})]The title is empty[ELSE]{title}[ENDIF]
Note: You might have seen examples using not(text())
to check for empty fields. While this is valid XPath syntax, it seems to fail on some servers. The reasons are unclear. Just use the Text is empty syntax above instead.
To anyone reading this:
I haven't worked for the company that makes WP All Import in several years and I don't use their plugin currently (as I'm not doing WordPress work). So unfortunately, I won't be able to answer your questions.
However, the support the company offers is pretty great. In fact it's some of the best I've ever seen. I encourage you to reach out to them on https://www.wpallimport.com with any questions.
I am leaving these gists up however since they do seem to help for quick reference.
Best of luck.
Mark