The semantic web, briefly
Two answers to the same question — how a web page tells a machine what it means — and why schema.org and microformats both ended up existing.
schema.org/Recipe
The vocabulary that every recipe site on earth emits — where Recipe sits in the schema.org hierarchy, what each property holds, and what the markup looks like in the wild.
hRecipe
The microformats recipe vocabulary — hRecipe and its microformats2 form h-recipe, built entirely out of HTML class names, property by property.