Am out of the office for a couple of days.
But, as Karen suggests, if we do not put in extra geometry types beyond
points, before we know it, implementers will be asking for an envelope or a
polygon.
FYI, thanks to the IETF folks, we have access to GML schema for ellipses
and a couple of other geometry types that are quite useful in emergency
services.
----- Original Message -----
Sent: Tuesday, February 06, 2007 2:26
PM
Subject: [emergency-msg] GML and
Resource
Folks,
I am trying to write the Data Dictionary reference
for our implementation of GML using geo-oasis.
In our structure
we have a "Location Type" consisting of three elements:
1.
LocationDescription: xsd:string
2. Address:
ciq:xal
3. TargetArea:
geo-oasis:where
My discussion
will concern only number 3 on this list.
The schema shows
the TargetArea element to be of TargetAreaType from the types
schema.
TargetAreaType should then be of type
geo-oasis:WhereType.
This is consistent
with our other Types so I plan to make the Data dictionary entries consistent
with the schema.
So far, no
problem.
Question: How
broad do we want our location to be?
An
geo-oasis:whereType gives a choice of
gml:Point
gml:LineString
gml:CircleByCenterPoint
gml:Polygon
gml:Envelope
Did we mean to
have Location have the option of all of these elements?
Or should I make
TargetAreaType a restriction on WhereType that limits the choices to one or
more of the options.
I originally
thought that Point would be simple and appropriate for resource messages (the
larger scope is certainly needed for future updates to DE and CAP). But the
name as TargetArea makes me think the larger scope was intended by the
committee for resource messaging as well.
Personal opinion:
For resource, I would rather use Point. Too many options already are making
resource messages harder to deal with.
I need a
consensus.
R/s
Gary A. Ham
Senior Research
Scientist
Battelle Memorial
Institute
540-288-5611
(office)
703-869-6241 (cell)
"You would be surprised
what you can accomplish when you do not care who gets the credit." - Harry S.
Truman