@Override
    public Value evaluate(Context context) {
        // TODO: Context should accept a Reference instead.
        if (reference.isIdentifier())
            return context.get(reference.name());
        else
            return context.get(getName(), getArguments(), getOutput());
    }
Returns the reference of this node
searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/ReferenceNode.java