Tracing Hieritage

I'm curious as to where specific classes or properties have come from.  I
was looking at:

   http://www.schema.org/NutritionInformation

which is traceable to the 'nutrition' property of 'Recipe' and so the
'Recipe' class came from where?

That is, I'm trying to understand those classes and properties there were
adapted from other existing vocabularies versus those that are "newly"
created.

-- 
--Alex Milowski
"The excellence of grammar as a guide is proportional to the paucity of the
inflexions, i.e. to the degree of analysis effected by the language
considered."

Bertrand Russell in a footnote of Principles of Mathematics