The schema/Recipe format is controlled by a very small number of big companies (Google/Bing/???), and is derived from the open community based hRecipe microformat.

Please support parsing the open hRecipe microformat directly:

http://microformats.org/wiki/hrecipe

And also parse the h-recipe microformats2 update.

http://microformats.org/wiki/h-recipe

For which there are also parsers:

http://microformats.org/wiki/microformats2#Implementations

Feel free to join #microformats on Freenode to join the microformats open community and ask any questions.