limit : None or str or list or dict
If None all elements will be included in the filter. If a single
attribute name is given, its unique values will be used to define
chunks of data that are marked in the filter as unique integers.
If a list given, then combination of those attributes is used as a pair.
Finally, if a dictionary is provided, its keys define attribute names and
its values (single value or sequence thereof) attribute value, where all
key-value combinations across all given items define a “selection” of
elements to be included in the filter (OR combination).
collection : Collection
Dataset attribute collection instance that contains all attributes
referenced in the limit specification, as well as defines the shape of
the filter.
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