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| | codasyl model - Re: XQuery and Hypertext (was Re: SGML on the Web |
 | | Mike Champion scripsit: > The key differentiator was that CODASYL ultimately > relied on "pointers" (which I'm pretty sure are functionally much like > hyperlinks, at least by analogy) to relate bits of information that did > not fit into a hierarchy, Actually, the CODASYL model was about multi-hierarchies, with none preferred. |
 | | Here's how you'd do the CODASYL model on a relational DBMS, which is historically backward, but a lot more people understand RDBMSes. |
 | | Data is kept in objects like relational tables, except that the primary key is always a generated unique ID. (Implementationally, this was an address.) Then there would be linkage tables, potentially one per pair of tables, with the fields , , . |
| www.stylusstudio.com /xmldev/200210/post30620.html (326 words) |
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