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RE: Lesson Learned: Use namespaces for both markup anddata
- From: "Glidden, Douglass A" <Douglass.A.Glidden@boeing.com>
- To: <xml-dev@lists.xml.org>
- Date: Wed, 12 Aug 2009 08:03:14 -0400
Okay, perhaps I should have worded that a little
differently: Using QNames in data dangerously de-atomizes the
data. I used the word "metadata" before because a namespace
prefix by itself can never really be considered data; outside of an XML
parser it is completely useless, and within the parser it functions only as a
pointer to a namespace identifier.
Doug
Glidden
Software Engineer
The Boeing Company
Douglass.A.Glidden@boeing.com
On Wed, Aug 12, 2009 at 4:20 AM, Michael Kay <mike@saxonica.com> wrote:
>
> I definitely don't agree with Roger's idea of using
QNames in
> data, either, though-IMHO that dangerously mixes metadata
with data.
>
But the notion that metadata and data can be
separated is itself deeply
flawed. If I have two lines of business,
"product sales" and "services", are
these two things data or metadata?
You'll find some systems in which they
are data (rows), others in which
they are metadata (columns). Similarly, if
I have three kinds of personnel,
"salaried", "hourly-paid", and
"contractors". Or if I have 23 kinds of
asset on the books, or 592 kinds of
equipment, I will sometimes want to
treat these as types and sometimes as
instances. Mixing metadata and data
is something we have to live with.
Functional data models rightly eliminate
the distinction.
Regards,
Michael Kay
http://www.saxonica.com/
http://twitter.com/michaelhkay
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