I have no idea if any internal numbering schemes are classified, but it's not a crazy idea. A numbering system can indicate capabilities (imagine seeing that i

I have no idea if any internal numbering schemes are classified, but it's not a crazy idea. A numbering system can indicate capabilities (imagine seeing that index 314-15.9 is 'questions to ask Hitler's brain') and how an organisation thinks about things. But yes, over-classification is possible. Fortunately, there are processes to handle that.