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RE: Logical models, hierarchy, network model

• To: "'Ken North'" <kennorth@s...>,<xml-dev@l...>
• Subject: RE: Logical models, hierarchy, network model
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Tue, 25 May 2004 22:18:21 +0100
• In-reply-to: <000401c4429c$13edcee0$1601a8c0@DURANTE>
• Thread-index: AcRCm6zR4ecXYbKATqGr4NrRc4/1wwAASTdQ

>Developers and/or tools need to understand how to navigate the sets (for
>example, whether the members are in ascending or descending order as you
>traverse a set).

That's true at the basic DML level. But a lot of developers used declarative
4GLs that abstracted away from such detail.

> (Aside: Software AG's Tamino might implement XML over a 
> network model. Adabas
> was one of the most successful CODASYL DBMS products.)

Actually, I don't think ADABAS ever was a CODASYL DBMS... it's essentially a
hierarchic database rather than a network database.

And Tamino is not implemented over ADABAS, though it does reuse code from
some of the lower-level components such as locking, page caching, and
indexing.

Michael Kay

• References:
  • Re: Logical models, hierarchy, network model
    • From: "Ken North" <kennorth@s...>

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