David Conrad's indirection.pdf triggers me to write one more word with respect to the major criticism of strategy C: There he states geo-based routing is bad and no one wants to change the economic model. Geo-based routing means doing routing just as if GPS-based. There are plenty of applications and business models today which are GPS-based. Talking something like this down isn't really up-to-date. When in former days a Siemens boss rejected to store music on a disk by arguing "this is future music" then, although not wise, could be excused by not knowing the future of the music-CD. But wireless phone and internet, i.e. GPS-based solutions are already current practice. Concurrently geo-based routing means metric-based routing. Without a metric you are lost. Try to find out whether 1.50000000001 is within the real numbers interval between 0 and 1 without a metric (without "<=", ">=" ). Or, which is more similar to routing, start with any real number s (like source) and find out whether you should search to the right or to the left on the real number ray without using "<=" and ">=" as to get to real number d (like destination). Heiner
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