Implement global variables within ArcGIS Desktop

Idea created by BruceLang on May 27, 2010
    This would make query definitions and various expressions easier to implement "across the board."  As one example, many layers contain a definition query to select records for a specific year from a joined database, like "taxyear = 2009"  I must manually change the tax year (2009) for all query definitions to implement a new tax year.  If global variables were available then when the global variable is changed the value would ripple throughout all query definitions.

    Global variables should be available everywhere a field or constant value are allowed.

    Global values are set within the map document and can be exported/imported like a traverse can from the traverse COGO tool.