danzel/TileStache — comment on commit 97f66afad570e068d8585700121a3cbf6afa59b9
File: TileStache/Goodies/Providers/UtfGridComposite.py line 2
By springmeyer:

the utfgrid spec has been split out from mbtiles (because it does not depend on schema or tile storage), so please link to this: https://github.com/mapbox/utfgrid-spec