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From "Reinhard Poetz" <>
Subject RE: XML-Relational Mapping (Was: USQL)
Date Tue, 24 Feb 2004 15:41:45 GMT

From: Daniel Fagerstrom

> Reinhard Poetz wrote:
> ...
> >It would be very cool if we could provide something that helps with 
> >flow applications. I like the combination of 
> OR-Mapping/CForms/Flow but 
> >this is for many beginners overkill. They shouldn't be 
> forced to write 
> >Java code e.g. in order to implement a simple register form.
> >
> >--
> >Reinhard
> >
> I think it is overkill for many non beginners as well ;)
> I am currently looking at XML-DBMS 2.0, 
>, which is an 
> XML/relational 
> mapping tool. The main idea is that you describe the mapping 
> between XML 
> and the relational db in a mapping file, then you can use the mapping 
> tool to both store the XML document in the db and retrive XML 
> from the 
> db. The detailed storing strategy - using overwrite or update 
> etc can be 
> fine tuned in another configuration file. And the retrieving 
> behaviour 
> can fine tuned with a filter file.
> XML-DBMS is intended for data centric rather than document centric 
> applications and provide a rather flexible mapping between one XML 
> document and a number of tables. It also contains a tool for 
> generating 
> maping files from DTD:s and, IIUC, from db meta data. It can also 
> generate create table statements from the maping file.
> I think XML_DBMS look rather promissing, and I have not found 
> any other 
> packages that dom direct XML relational mapping, all other seem to 
> require Java objects in the middle. Anyone that know about 
> any simmilar 
> packages?
> Possible drawbacks are that the community is very small, and that the 
> packaging is not that good: no ant script. The documentation is good 
> however, Ronald Bourret, the main author have written a number of 
> articles about XML mappings.
>  The licence is: "XML-DBMS, along with its source code, is freely 
> available for use in both commercial and non-commercial 
> settings. It is 
> not copyrighted and has *absolutely no warranty*. Use it as you will."
> Given that XML-DBMS holds what it promise, I will try to 
> build an block 
> around it. My idea is to use XML-DBMS from flowscripts, so 
> the best way 
> to integrate it would probably be to write some component, like 
> pipelineUtil around XML-DBMS. An SQLToXMLTransformer 
> XMLToSQLTransformer 
> pair would also be a possibility.
> Others interested in such a block? Opinions?

I'm not sure. Please see my mail "Connecting databases with Cocoon" and
then we should find szenarios where your solutions fit (one example I
can think of is mentioned in this mail).


> /Daniel

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