[fdo-trac] #243: SDF: support making value constraints more restrictive

[FDO]

#243: SDF: support making value constraints more restrictive
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   Reporter:  brentrobinson  |       Owner:  brentrobinson                                
       Type:  enhancement    |      Status:  new                                          
   Priority:  minor          |   Milestone:  3.3.0                                        
  Component:  SDF Provider   |     Version:  3.3.0                                        
   Severity:  2              |    Keywords:  SDF Apply Schema Value Constraint restrictive
External_id:                 |  
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 The SDF Provider's FdoIApplySchema currently disallows the following for
 data properties with values:
     - Add a new constraint
     - Modify an existing constraint by making it more restrictive.

 Under this enhancement, the above 2 types of modifications will be
 supported. It is possible for existing property values to violate the
 new/modified constraint. All data values will be checked. If any do
 violate the constraint, and exception will be thrown similar to:

     Cannot modify constraint for property
 'constraints:CDataBaseClass.StringList';
     existing data value 'close' violates new constraint

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Ticket URL: <http://trac.osgeo.org/fdo/ticket/243>
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