A DatasetOrder object is a subclass of list
that contains
DatasetGroups. DatasetGroup objects contain a group name and an set of
"entities", which can be dataset references or other nested DatasetGroups.
group
character, the name of the DatasetGroup. In the constructor and more generally, this field can be referenced as "name" as well.
entities
a character vector of dataset URLs, or a list containing a combination of dataset URLs and DatasetGroup objects.
This API is deprecated. Use folders instead.