Returns a dictionary of features classified by specified element attribute.

Returns feature collection satisfying specified filter conditions.

Returns all elements from feature collection. If no elements were found, returns empty collection.

Returns either simple or aggregate geometry out of all features geometries in a collection. If no geometry was found, returns empty geometric set.

Returns aggregate value for specified meta-property, type out of all features in a collection. Optional parameter enables specifying output value type - either a single value or collection of values. Returns True if specified value types were found, otherwise returns False.