recipe-formats
One of the available recipe formats is the recipe markup language
Recipe Markup Language
It was (formerly known as DESSERT -- Document Encoding and Structuring Specification for Electronic Recipe Transfer) is an XML-based format for marking up recipes. The format was created in 2000 by the company FormatData.
The format provides detailed markup for defining ingredients, which facilitates automated conversions from one type of measurement to another. The markup language also provides for step-based instructions. Metadata can be added to a RecipeML document through the Dublin Core.
There are some software programs that read and write the RecipeML format. The most notable of these is Largo Recipes. The RecipeML license is fairly open.
This archive contains 10,000 recipes in Recipe Markup Language
RxOL
RxOL uses a postfix notation to represent recipes.