In the app, users can add custom meta data to objects. For example, a 'restaurant' object can contain metadata with <Rating, Int>, <Website, URL>, <Menu, Photo> and so on. Other another example would be a 'walking goal' object with custom meta data of <Time Taken, Date> and <Steps, Int>
I'm thinking of words like 'properties' or 'attributes', but I think the word/concept can be simplified further.
Thanks in advance!