Resolved Conditional product_in_stock need help

Hello there,
I hope this find you doing well.
I want to have a google xml field set like this :
if product_in_stock < 1 (or/and) stock = 0 (or/and) Empty THEN g:availabiliy = backorder
if product_in_stock > 1 THEN g:availability = in stock
Even if the product_in_stock = 0.0 the xml output = in stock
What's wrong in the rule (and/or) in the product_in_stock field I set please ?

Note : in the database, product_in_stock have one float decimal (exemple 0.0 or 1.2)