[Geopriv] HELD, Re: [Fwd: Minneapolis IETF Code Sprint]

[Julian Reschke <julian.reschke at gmx.de>]

Hannes Tschofenig wrote:
> Another chance to get together and todo interop testing with GEOPRIV and 
> ECRIT protocols.
> 
> Are there some new folks interested in joining?
> 
> Ciao
> Hannes
> 
> PS: Information about our IETF#72 activities can be found here: 
> http://geopriv.googlepages.com/
> ...

Ah, very interesting.

Under "LIS Demonstration Page" I read:

"The LIS includes an AJAX application that displays the current position 
of the requestor of the page and give them an opportunity to update 
access point locations based on where they are.  JavaScript code in the 
demonstration page directs the client's browser to send a HELD query to 
the LIS (asking for civic location).  This request returns the user's 
location as a PIDF-LO, and makes it available as a JavaScript DOM 
object.  The browser pulls civic address information from this structure 
and plots it on a map of the IETF venue.

Also, since the LIS is manually provisioned (by users providing AP 
locations), the demo page offers users an interface for users to specify 
their location when location information is missing or incorrect."

The diagram below shows that the Web Server on the LIS uses 
XMLHttpRequest to perform the HELD request.

I'd like to understand how the syntax shown in the HELD examples in 
<http://tools.ietf.org/html/draft-ietf-geopriv-http-location-delivery-08#section-11.1>:

          GET heldrefs://lis.example.com:49152/location HTTP/1.1
          Accept:application/held+xml,
              application/xml;q=0.8,
              text/xml;q=0.7
          Accept-Charset: UTF-8,*

can actually be used with XMLHttpRequest. It seems to me that this 
requires that XmlHttpRequest somehow magically understands the 
"heldrefs" URI scheme. How does that work?

Best regards, Julian

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