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RE: XML versus Relational Database
- From: "Bullard, Claude L (Len)" <clbullar@i...>
- To: Linda Grimaldi <grimlinda@e...>,Jonathan.Robie@S..., snowhare@n...,cclewlow@e...
- Date: Fri, 02 Feb 2001 10:03:28 -0600
Title: RE: XML versus Relational Database
Nothing. I am saying any of that can be had pretty much
anytime with commercially available systems. Today,
XML
and databases are embarassingly surfeit with
capability and it becomes a problem of choosing well.
On the
other hand, we have been handling the problems
of
heterogeneity and transform well without XML or
XSLT
for quite some time now. It is expensive
and
one-off, but XML and XSLT only bring down
the
complexity of that. The need to negotiate,
analyse, plan, propose and resolve are still
the
expensive bits and it is still noisy. The problem
is one
mans metadata IS another mans data
and
the differences are what take up all the time
and
profit. You are glossing across that "semantically
equivalent" problem too easily. Technology is not
the
issue there. Locality is.
Len Bullard
Intergraph Public
Safety
clbullar@i...
http://www.mp3.com/LenBullard
Ekam
sat.h, Vipraah bahudhaa vadanti.
Daamyata. Datta. Dayadhvam.h
I
guess I don't quite understand the statement that "XML vs Relational DB is a
non-issue". If your needs are extremely data-centric and you don't much
care about extensibility- the info you store does not change structure- then I
suppose there is truth to it. However, for heterogeneous stores of
information from multiple sources, many of whom, despite best efforts, may not
conform to a standardized schema and yet may be providing semantically
equivalent data, it seems to me that an RDBMS solution, with or without
embedded XSLT, is pretty much inadequate, mostly due to the need for metadata
predefinition in an RDBMS and for performance issues around
transformation.
XML
allows metadata and data to be treated symetrically, with context dependent
entirely on each query. One man's metadata is, after all, another man's
data. RDBMs, by their very nature, strike me as quite limited in this
regard. What am I missing?
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