@Scott funny then we have dispense of the separation of formats :( Unfortunately humans need abstractions, even your abstractions suck from someone else perspective. But yes your right. But in that case you should not say PDF is not a vector format you should explain that vector formats dont really exist or mean what people think they mean.
Personally id been inclined to say PDF is a "vector format" BUT vector formats are super sets of All image formats that can display anything. DANG now Im shooting myself down because cad formats are vector and can only sometimes contain pictures... Crap…