In your CER rule sets you will use CER's <readall>/<match> expression to access rule objects converted from active evidence row data.
You may only specify the retrievedattribute to be the caseID.
If you attempt to specify a retrievedattribute to be the name of any other attribute, then the Active Evidence Row Rule Object Converter will throw a runtime exception when the CER <readall>/<match> expression is executed.
You may specify the ruleset and ruleclass for the <readall> expression to be a rule class mapped by the data configuration. If you attempt to specify a rule class which is not directly mapped (e.g. a base rule class that you have created from which your concrete rule classes inherit) then no rule objects will be found.
Such an unqualified <readall> would typically retrieve a very large number of rule objects and no dependency on the overall set of rule objects will be stored.