Maintains Selection state for a Map, used in conjunction with the LayerManager by the renderer to determine screen appearance.

Functional Requirements

• selection by map interaction
• selection by table interaction
• selection by "Query" ui
• scalable
• programmatic access for operative plug-ins

Non Functional Requirements

• sub-second notification of selection activity
• selection should take less then 5 to 10 seconds for alpha

Design Notes:

• maintain a Filter associated with each Layer
• Filter can be Fid based to capture individual selections
• Filter can be BBox based to capture spatial selection on Map
• Filter can be be constructed via a "Query ui"
• Selection inverts can be formed quickly with the use of "not( filter )"
• receives events from Visualization Stack and transforms Bbox into the "Layer" coordinate system.