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Re: XML to object relational

• To: brahim <brahim@n...>
• Subject: Re: XML to object relational
• From: Ronald Bourret <rpbourret@r...>
• Date: Wed, 27 Feb 2002 04:20:50 -0800
• Cc: xml-dev@l..., jnbello@p...
• References: <Pine.LNX.4.44.0202261646500.32366-100000@u...>

I am not sure what you mean by mapping an XML document instead of
mapping a DTD (or other XML schema). For example, do you mean that I can
map the first A element in an XML document to table A1 and the second A
element to table A2? One way to do this would be to use XPointers in the
mapping information to identify individual elements and map these to
objects / the database. However, there doesn't seem to be much point in
doing this.

My guess is that your question is really how to map a document to the
database when the document doesn't have a DTD. Technically, no DTD is
necessary. At run time, the software just looks at the name of an
element/attribute, gets the mapping information, and transfers the data
to the correct table/column. No DTD is involved.

However, when you build the map, you essentially build a DTD. This is
because all elements of the same type are transferred the same way.
Thus, the map effectively defines the DTD. For example, if element A has
a child B in one place and a child C in another place, the map must map
both children.

Does this help?

-- Ron


brahim wrote:
> 
> I am looking for a mapping method from xml Docment(not a DTD) to Object
> Relational model so if anyone can help me I'd appreciate it...
> However I found a paper titeled:
> Shuichi Nishioka, Makoto Onizuka: Mapping XML to Object Relational Model.
> International Conference on Internet Computing (1) 2001: 171-177
> but I could not find it anywhere on the internet...
> if anyone can send it to me or send me the link to it , I would be so
> thankfull to them...
> Thanks.
> Brahim.

-- 
Ronald Bourret
Programming, Writing, and Research
XML, Databases, and Schemas
http://www.rpbourret.com

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