| http://www.w3.org/ns/prov#value | - The ChatLeftEvent may have the following format: eventfamily=???chat??? of type ???string???; eventtype=???ChatLeftEvent??? of type string; parameters including [???user???, ???chat???] of type composite; a user=userID of type string (e.g., a unique identifier, such as an email address; and a chat=???chatID??? of type string (e.g., a unique chat identifier).
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