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• The "key" attribute tells the validator to check for a message resource bundle.
• In the resource bundle, the expression

  No Format
  ${getText(fieldName)}

  tells the framework to lookup the field name in the bundle too. This way we can use the same default message for all the requiredstring validators.
• Likewise, in the text filed, the expression

  No Format
  %{getText('password')}

  tells the framework to lookup "password" in the message resources.

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