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RE: typing (was RE: Personal reply)
- From: "Bullard, Claude L (Len)" <email@example.com>
- To: Charles Reitzel <firstname.lastname@example.org>, email@example.com
- Date: Wed, 14 Mar 2001 08:47:18 -0600
Discoverable services will depend on a requirements match and it isn't
just dynamic machinery (that is probably a pipe dream).
What I read says an enterprise engineer discovers the
first level, reads the service descriptions, and by
citation, discovers if the schemas or DTDs provide
what they need. Then they create scripts that route
data among the applications (eg, XLang). So, this is automation
of how it is done now with the enterprise engineer
stepping into some roles that used to be done
by logistics analysts.
Also, one of the requirements for using applications
often means the local requirements are adjusted to
conform to the application. Customization down to
the deeper local levels for every bowl is too
expensive to justify. It's a big issue with QBE
systems because the forms have to be integrated
in ways that often vary from the local process.
The local process isn't holy. Changing it is a cost tradeoff
with political ripples but a part of doing business.
In many ways, this is precisely why DTDs and
Schemas are used. Until a standard for the
data and data types exists, it is a dicey proposition
to create products for that market particularly
if the data created must be aggregated in larger
sets. The NIBRS standard for law enforcement
is a perfect example. It enables us to create a
product with a common base of information, but
also a certain amount of customization given that
each state plays with that format a little. The
actual cost that makes this very hard for the
last mouth in the food chain (the FBI), is that
they allowed a company to foist old style byte
counting validation on them, so the validation
costs are enormous and the data has to be pushed
up from each agency, not pulled on demand.
Were they to go to XML and schemas, we could go
fast. As it is, this is going to be a bottom
up and more expensive than it has to be affair.
It will happen contract by contract. It will
be "simple" and when all the "simple" solutions
collide, it will be a mess to be cleaned up.
BTW, for the CSV fans, it won't work when the
pipeline gets long and the systems are heterogeneous.
Intergraph Public Safety
Ekam sat.h, Vipraah bahudhaa vadanti.
Daamyata. Datta. Dayadhvam.h
From: Charles Reitzel [mailto:firstname.lastname@example.org]
1) By separating DTD/schema-supplied pieces out of the Infoset you break all
the instance documents that depended on those items being *included*. Why
would anyone use those DTD/schema features if they didn't intend this
2) One doesn't include arbitrary DTDs or schemas into production pipelines.
You have to evaluate each such document individually for compatibility with
local processing requirements. Anything else invites disaster. Thus, for
the time being, the pipe dream of dynamic integration of discoverable
services is just that.