For an AR framework of this kind, we clearly need a format for POI.

KML is not suitable because it was build to put graphics information on digital images tiles and not build for AR.

For AR, we need something probably simpler, i.e. defined at a higher level by using URIs. (Graphics data is embedded in the KML document)

Instead of specific graphics data embedded in the format, we need references (URIs) to TEXT objects., 2D objects, 3D objects, sound objects

in standardized format (XHTML, SVG, X3D or collada, A2ML or something else).

It should not be to difficult to define such a format as a mapping from Geographical data to URI's

I'd especially be interested to hear about broadening it out from just
sound files to including sound streams.

There is nothing special around streaming a sound source or putting it in the RAM, at least with

respect to the goal of this mailing list

Personally, if I look around, the white headphones I see everyone on the
street wearing suggests to me that the iPod is now the currently
dominant form of Augmented Reality/Wearable Computing. It's just that
this audio has no awareness of the context around it and is not
integrated with sensor data in any way.