The or clause is used between selection criteria clauses to indicate that either condition being evaluated as true selects the item for processing.
with clause or with clause
This example lists those items that meet one of two criteria: a name starting with ar and with a city starting with irv, or, a city starting with san and a contact containing the string joe.
list entity with name "ar]" and with city "irv]" or with city "san]" and with contact "[joe]"