+
+ /**
+ * SECTION:vikslippymapsource
+ * @short_description: the class for SlippyMap oriented map sources
+ *
+ * The #VikSlippyMapSource class handles slippy map oriented map sources.
+ * The related service is tile oriented, à la Google.
+ *
+ * The tiles are in 'google spherical mercator', which is
+ * basically a mercator projection that assumes a spherical earth.
+ * http://docs.openlayers.org/library/spherical_mercator.html
+ *
+ * Such service is also a type of TMS (Tile Map Service) as defined in
+ * OSGeo's wiki.
+ * http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification
+ * But take care that the Y axis is inverted, ie the origin is at top-left
+ * corner.
+ * Following this specification, the protocol handled by this class
+ * follows the global-mercator profile.
+ *
+ * You can also find many interesting information on the OSM's wiki.
+ * http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
+ * http://wiki.openstreetmap.org/wiki/Setting_up_TMS
+ */
+