In FX, you could use

$PubFind -> AddDBParam('PubStatus', 'Killed', 'neq');

to find all records where PubStatus does not equal Killed. Adding a third parameter in the FM API like this:

$PubFind->addFindCriterion('PubStatus', 'Killed', 'neq');

produces an error. Then I tried:

$PubFind->addFindCriterion('PubStatus', 'Killed');

$PubFind->setOmit('TRUE');

mimicking the way you do it in FileMaker. That errors too. I guess the setOmit must be part of a compound find. I could build a compound find but that seems fussy for something so simple.

yep you have to do a compound find to set omit.

It has to do with how the cURL request to the XML server is formed. Basically they didn't set up an omit parm to pass to the request so the only way to pass it is via the query String, and that parm is only used by the compound find.