Understanding Open Erp Domain Filter ?

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PostgreSQL

HI I would like to ask you if you could please explain the anatomy of the Openerp domain filters. I have to use it my project. Please explain the anatomy and description of the following domain filter .

['|',('order_id.user_id','=',user.id),('order_id.user_id','=',False)]

If you are having any resource concerning the same then please share it .



Thanks in advance ..