I would like to know how I can add attributes to taxonomies and allow those attributes to have different values in different posts.
For example, let's say I have a recipe custom post type and I have ingredients as a taxonomy. The amount of each ingredient to use could be different for different recipes.
So how would I implement such attributes into WordPress in a way that maintains my data integrity and also allows me to insert the attribute values from the post creation page?
Please note that this is only an example, I'm asking about this concept in general.