OASIS Emergency Management TC

  • 1.  schemaLocation for validating local copies of standards

    Posted 03-25-2007 14:28 
    Hi Everyone,

One of my action items from last week's TC meeting was to post a 
message detailing how to provide and specify a locally stored copy of 
an XMS Schema from a standard rather than requiring a parser to find 
the document on the web in order to validate it.

The problematic part of validating The XML Schema from standards is 
that you must cite the namespace. This is specified as a URN (Uniform 
Resource NAME), which is pretty straightforward since we are 
specifying a NAMEspace. However, a urn just specifies the legal 
provenance of the NAME.

This is the point that is usually missed.

You should also specify a URL to the "schemaLocation." If you specify 
the location where the standard is supposedly, or is supposed to be 
kept you can get into trouble if the site is down for maintenance or 
under a denial-of-service attack. Plus you would be wasting bandwidth 
that is especially important during an emergency incident.

If your system's validator can't validate the schema from the remote 
location, your system could break. So it is better to keep a local 
version, which also gives you complete control over the correct 
versioning for your applications.

You should keep a correct version of any standard or set of standards 
your system uses, or that are included within other standards your 
system uses. However, you still need the schema(s) as separate .xsd 
files because these are the files you specify in the "schemaLocation" 
which allows your validator to validate the schema locally and 
prevent inadvertent failures of the kind mentioned above.

For reference, here's an example:

http://www.stylusstudio.com/w3c/schema0/schemaLocation.htm

For CAPv1.1Errata you need the file: cap1.1.xsd

Here's a sample of what I would use:


  • 2.  RE: [emergency] schemaLocation for validating local copies of standards

    Posted 03-27-2007 13:22 
    Hey Rex (any everyone else),

  The Adoption SC would love any ideas or content you'd like to work on
as part of an instructional cookbook.  I'm planning on putting together
some coding examples for the .NET platform of standard operations that
are part of working with the standards.  If there are any other coders
out there that would like to contribute examples for other platforms
please let me know. (Java would be a big help).  Some ideas I've had for
examples are:

1. Generating proxy classes from a schema.
2. Validating an xml string against a schema.
3. Consuming a web service that uses one of the standards.  DM OPEN
would probably be the first choice. 

--Josh

Joshua Shows

Software Engineer

Emergency Services integrators (ESi)

699 Broad St, Suite 1011

Augusta, GA 30901

706-823-0911

jshows@esi911.com



    
                                                
    
					
                                                    

        
                                                
				
    
                                                
    
                                                    
                                                        
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  • 3.  RE: [emergency] schemaLocation for validating local copies of standards

    Posted 03-27-2007 14:56 
    Josh,

I think that's a great idea. I'll try to round up some Java for you.

Patti

Patti Iles Aymond, PhD 
Senior Scientist, Research & Development 
Innovative Emergency Management, Inc.
Managing Risk in a Complex World

8555 United Plaza Blvd.   Suite 100 
Baton Rouge, LA 70809 
(225) 952-8228 (phone) 
(225) 952-8122 (fax) 


    
                                                
    
					
                                                    

        
                                                
				
    
                                                
    
                                                    
                                                        
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  • 4.  RE: [emergency] schemaLocation for validating local copies of standards

    Posted 03-27-2007 19:10 
    I am also updating my code samples.  I use Arts caplib for parsing the
XML in CAP.  I also use Joda-time (this is new as of today) to do any
time related calculations as well as proper ISO string formatting.  Joda
Time get around all the BS of the Java Calendar class AND lets you
import from and export to a Calendar. Joda-time will be useful for all
Java users  of our standards regardless of whether they also connect to
DM-OPEN.  I have already found it immensely useful for debugging our
time related query issues.  (I find the Java Calendar to be almost
useless in that its results when dealing with multiple time zones seem
to me to be incomprehensible and inconsistent. Maybe it is just me. But
Joda time works and is designed for ISO 8601) 

The link:

http://joda-time.sourceforge.net/index.html
   


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


    
                                                
    
					
                                                    

        
                                                
				
    
                                                
    
                                                    
                                                        
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