Tuple
A tuple is similar to a row in a database table: it is a container for data. Specifically, it is a sequence of named elements called fields (similar to the columns in a database table) which contain values of a specific type. Each tuple in a space represents a set of related data.
Fields have a name and a type. A tuple can be seen as a kind of map on which fields can be 'put' or 'removed'. A tuple can also be seen as a self-describing message. Tuples are platform independent, and can be serialized and deserialized.
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