return((VariableBase)_variableScope.get(name));
Object existing = _variableScope.get(name); if (existing instanceof VariableBase) { return((VariableBase)existing); } else if (existing instanceof Stack) { Stack stack = (Stack)existing; return((VariableBase)stack.peek()); } return(null);
    public VariableBase lookupVariable(QName name) {	return((VariableBase)_variableScope.get(name));    }