Content Category (Node Type)
Document Types in a Content Model may be organized into Content Categories. A more complicated set of documents may exist, where some Document Types are a sub-category of a larger Document Type. This is part of creating a hierarchical structure in a Content Model.
For example, if a set of documents contains Invoices, Checks, Receipts and Purchase Orders, they might fit into a Content Category of "Payments" and other Document Types might be placed under other Content Categories. All of the Document Types in the "Payments" Content Category would inherit from both the Content Category and the Content Model itself.