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https://issues.apache.org/struts/browse/WW-2475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43173#action_43173
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Dave Newton commented on WW-2475:
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Doesn't this already exist?

I thought you could do model-based validation and, in addition, refer to 
model-based validation via the visitor field validation.



> Provide a way to share validation.xml rules with ModelDriven
> ------------------------------------------------------------
>
>                 Key: WW-2475
>                 URL: https://issues.apache.org/struts/browse/WW-2475
>             Project: Struts 2
>          Issue Type: New Feature
>            Reporter: Sami Dalouche
>
> In Short:
> "ActionA" and "ActionB" both implement ModelDriven to expose an instance of 
> "ModelClass" on the value stack.
> Some properties might be set on ModelClass. "ActionA" and "ActionB" have the 
> same validation rules for properties of ModelClass.
> => It would be useful to share a set of validation rules in 
> ModelClass-validation.xml.
> Does XWork allow validating other objects than actions ?

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