On 01/06/2007, at 2:26 AM, Mike Kienenberger wrote:
You might want to grab some of the info onhttp://cwiki.apache.org/confluence/display/CAY/Is+Inheritance +Supportedand merge it into your new document. I'm thinking specifically about the additional names by which vertical, horizontal, and single inheritance are known by. This makes it easier for folks coming in from an ORM where the terminology is different.
Is that terminology right? That page says: * single-table == flat == table-per-class-hierarchy * Vertical == table-per-subclass * Horizontal == table-per-concrete-class My page says: * single-table * horizontal == table-per-class * vertical == joinedI don't see how table-per-class can be used to describe single-table inheritance, since there isn't a table per class. Just one table. And vertical isn't table per subclass, it also has another table. Finally, there is no reason the horizontal superclass can't be concrete.
If anything, horizontal should be described as 'table-per-subclass'.The terminology is very important I agree, but do you have any references for those terms, so that we can use the what people will be expecting to see? The main references we've been looking at are the JPA docs, Hibernate and WO docs.
Cheers Ari --------------------------> Aristedes Maniatis phone +61 2 9660 9700 PGP fingerprint 08 57 20 4B 80 69 59 E2 A9 BF 2D 48 C2 20 0C C8
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