Arity in Persistent BB

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Arity in Persistent BB

sachini weerawardhana
c beliefBaseClass
"org.hsqldb.jdbcDriver", // driver for HSQLDB
"jdbc:hsqldb:bookstore", // URL connection
"sa", // user
"", // password

Hi All,
I am trying to use a mysql db for an agent's belief base and came across this example in the API. I am in need of a clarification.
#1 What is meant by arity here? it is not just a random number is it?

#2 if defined like publisher(2) what does it convey about the table publisher?

Many thanks

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