Represents a catalog dataset. A catalog dataset is the container for item
references, which are called catalog dataset items - not unlike raster
references stored in a raster catalog
Catalog datasets function similarly to polygon feature classes, with some essential differences. When viewing the dataset's attribute table, each record is an item in the catalog dataset containing a reference to its data path. The Shape field includes the footprint geometry for each item. This means that all catalog dataset items must have a spatial geometry — you cannot add tables or table web layers to catalog datasets. The footprint envelopes all of the item's features, rasters, and so forth. Each footprint feature's attributes are properties specific to the purpose, scope, and validation status of each dataset item.You can add, update, and maintain your own fields and values in the dataset's attribute table, and establish a join or relate with other tables, but you cannot access or edit the attribute table of the containing footprint layer.