Specifies a modeled object that has an identity within its model and
used directly in forming business queries. The principal point for this interface is
is that these objects are directly used in forming a business query and as such, this
interface is a "tag" interface to group particular object types together.
Other BusinessModelObject objects that are not business items usually have an indirect effect
on the query specification provided by a business query, but are not directly specified
within that business query.