Psychogeographical Markup Language
Via Social Fiction :"PML is a protocol that contains transferable & unified metadata about space recorded during psychogeograhical drifts. PML is the name of the data-structure behind the psychogeogram: the diagrammatic representation of both informational, physical & emotive aspects of urban space."
I am strongly in favor of that kind of thing !!!!! The future : street artefacts and street shops will contain RDF data !