Changes

* [[createCity]] and [[deleteCity]]: You will need to be able to register cities with and remove them from the database.  (The spec refers to this database as a "dictionary.") No two cities can have the same coordinates or name.

* [[createCity]] and [[deleteCity]]: You will need to be able to register cities with and remove them from the database.  (The spec refers to this database as a "dictionary.") No two cities can have the same coordinates or name.

* [[mapCity]] and [[unmapCity]]: These take a city that's already registered in the database and add it to or remove it from the spatial datastructure.

* [[mapCity]] and [[unmapCity]]: These take a city that's already registered in the database and add it to or remove it from the spatial data structure.

* [[listCities]]: Output a sorted (XML) list of cities in the (database? spatial datastructure? graph?).

* [[listCities]]: Output a sorted (XML) list of cities in the database.

* [[rangeCity]]: This searches the spatial datastructure for all cities within a given radius of a given point.

* [[rangeCity]]: This searches the spatial data structure for all cities within a given radius of a given point.

* [[nearestCity]]: This finds the nearest city to a given point (in the database ?).

* [[nearestCity]]: This finds the nearest city to a given point in the spatial map.

* [[printPRQuadtree]]: This outputs an XML (textual) representation of the spatial datastructure.

* [[printPRQuadtree]]: This outputs an XML (textual) representation of the spatial data structure.

* [[saveMap]]: This outputs a visual representation (an image) of the spatial datastructure.  See [[CanvasPlus]].

* [[saveMap]]: This outputs a visual representation (an image) of the spatial data structure.  See [[CanvasPlus]].

* [[clearAll]]: Clears all of the datastructures, removing all elements.

* [[clearAll]]: Clears all of the data structures, removing all elements.

== Input ==

== Input ==