[Myfaces Wiki] Update of "Extensions/Validator/ConceptOverview" by GerhardPetracek

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The "Extensions/Validator/ConceptOverview" page has been changed by GerhardPetracek:
http://wiki.apache.org/myfaces/Extensions/Validator/ConceptOverview?action=diff&rev1=7&rev2=8

  
  === Validation interceptors (since x.x.3) ===
  
- Mechanism which allows to implement global as well as (constraint) local interceptors (before and after validation). They get invoked in any case.<<BR>>
+ Mechanism which allows to implement global as well as (constraint) local interceptors (before and after validation). They get invoked in any case.
- Details will be available before the x.x.3 release.
  
+ === Generic Storages (since x.x.3) ===
+ 
+ Mechanism which allows to implement storages with different scopes and functionality but a generic mechanism to manage them.[[BR]]
+ Developers can resolve and reset storages via a generic api. To identify a storage a storage-type and storage-name is required. So it's possible to have multiple storages with the same type.
+ 
+ === Constraint severity (since x.x.3) ===
+ 
+ Allows e.g. to show validation warnings instead of errors.
+ 
+ === Meta-data storage filters (since x.x.3) ===
+ 
+ Allows to filter (add/remove/change) meta-data before it gets added to the meta-data storage (=basic cache) directly after the extraction process.[[BR]]
+ The meta-data storage is a cache to improve the performance of the extraction process. So all dynamic mechanisms of ExtVal (e.g. metadata extraction interceptors) are compatible.
+