In entity-relationship modelling it is convenient to work with entity types, rather than
simply entity occurrences. In much the same way, object-oriented modelling uses the
concept of an object class (orclassfor short) to represent all occurrences (or instances)
of an object that have the same definition (attributes + operations). (Some authors
distinguish between an object type, which is an implementation-free concept, and an
object class, which is an implementation construct.)
'DWDVWUXFWXUHV
Object-oriented modelling also differs from the basic relational model in that the
former favours the use of more complex data structures ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.