Using The Principle of Least Power As A Razor

When selecting a language, how does one know when it has the 'least power'?

o  Is Assembler less or more powerful than C?

o  Is C less or more powerful than C++?

o  Is Lisp less or more powerful than Prolog?

o  Is RDF less or more powerful than Conceptual Graphs?

o  Are Conceptual Graphs more or less powerful than Topic Maps?

o  Are DTDs less or more powerful than Schematron?

A principle or axiom is of no value without the rules for applying it. 

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