I have an object containing Hashtable. I want to take the value from the hashtable and use it for the LHS side of the rule. How do I do that?

Object: Test
Hashtable in Test: inputHT (the hashtable contains the key as 'age' and value as '21'. Like: inputHT.put(age, new Integer(21)) )

The rule defined is:

rule "male"
when
t:Test(inputHT.get("age") >= 21)
then
System.out.println("Adult");
end

It throws error as: unexpected token 'inputHT'
mismatched token .... expecting type )......
Please reply soon

Also tell me how to use variables in Object within another object in Rules defining process.
For eg: A variable skill1 (String) present in Skill object, which in turn is present in Employee object. How to define the rule for skill1.