[rules-users] declared variables in rules loaded to the same knowledge base

We have 2 rules - rule 1 and rule 2, both have declared variable @role(event) In the program with statements to define the rule << String rule1 = "package test001 import com.icil.event.*; declare EventImpl @role(event) end rule \"test 001\" when Integer() then System.out.println(\"rule test 001: there is an integer\"); end "; String rule2 = "package test002 import com.icil.event.*; declare EventImpl @role(event) end rule \"test 002\" when Integer() then System.out.println(\"rule test 002: there is an integer\"); end "; and then try to load these two into the same knowledge base using Drools 5.3, will get an runtime exception. But Drools 5.2, this is ok, with no error. Then in Drools 5.2 We try to print the address of the variable 'event' in the RHS of both rules, the address is the same in both rules, which means they are sharing the same instance? Is it the declared variables with the same name in separate rules being loaded in the same knowledge base, will just have ONE instance? Thanks Salina