anchor.diff:  [source, java]
   -----------------------------------------------
   try{
  -    ConfigurationFilter.getMapFilters().addFilter(new RegexPropertyFilter("\\_.*"));
  +    ConfigurationFilter.getMapFilters().addFilter(new myFilter());
   
       // do your code with filtering active
   }
  
positive.code: 
  === The Extensions Provided
  
  Tamaya Filter comes basically with 1 artifact:
  
  * The +org.apache.tamaya.filter.ConfigurationFilter+ provides several static methods to register +PropertyFilter+
  instances on the current thread.
  
negative.code: // specific language governing permissions and limitations
  // under the License.
  
  = Apache Tamaya -- Extension: User Filtering
  
  toc::[]
  
  
  [[Optional]]
  == User Filtering (Extension Module)
  === Overview
  
  The Tamaya filter module provides a simple singleton accessor that allows to explicitly add +PropertyFilter+ instances
  active on the current thread only. This can be very useful in many scenarios. Additionally this module adds
  standard filters that hide metadata entries when the full configuration map is accessed. When keys are accessed
  explicitily no filtering is applied and everything is visible.
  
  === Compatibility
  
  