[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Question for updating existing XML file
Yes, they do become an issue. The more games we play with metametameta sources to generate applications via joins, the more the system starts to crawl. There are definitely tradeoffs among approaches that say "code fast and get something running" and those that say "model it all then implement it". I don't want to restart that permathread, but an approach that unites triadic relations to objects and relational stores should sort that out. Ontological lifecycles (versioning, etc.) have to be controlled if they are to be dynamic. Jeff Heflin's paper at http://concept.cs.uah.edu/ takes up the topic. Harry's paper is an informative read and mentions the Helsinki principles (ISO TR9007:1987). The Meme paper (ref'd yesterday) is very good although deep and long. Good thread. Again, there's a publication in this topic because hybrid systems seem to be a permanent aspect of the landscape. I hope one of you takes the time to write it. len From: Hunsberger, Peter [mailto:Peter.Hunsberger@S...] He, he, yes, with sub-second response time. Joins do eventually become an issue, a couple of weeks ago, in a note to myself about optimization I wrote: "The joins across the system for the constant resolution of type data are killing us. [Big RDBMS vendors product] just can't keep the precedence of the relationship structure straight WRT to the originating query focus. Why should it? How should it know what we don't already know? If we knew the relationships in advance the schema would be fixed instead of dynamic!" That (and some discussions on xml-dev) is partly what lead me to a triples model in a relational database: we were joining for relationship type instead of explicitly modeling them in the first place. <snip>Danny's responses -- see my other reply to him</snip>
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