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Metadata best practice
In some use cases, multiple NFT classes might belong to a larger collection. i.e. classes are created and organized to form a collection, We would call these meta collections, please define these metadata fields in the related NFT classes.
Note that these field are merely used as a standardize and convenient way to tag classes. Chain logic does not enforce any uniqueness and validity check for these fields, so it is up to the users and develop to verify if any class tagged with a same
nft_meta_collection_idactually belongs to any creator or collections.