limit : None or str or dict
If None all elements wil be included in the filter. If an 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. 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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