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Tags in validation.xml

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I am trying to understand how to use the <arg.. tag in my validator.

1. What is the significance of using a 'name' inside the arg tag ?
2. How to use it (should the value of the name attribute be same as the rules defined in the depends attribute) and when to use it ?
3. Can it be omitted or it's been made mandatory by the rules ?
4. How can I know what should be the <var-name> for a rule or can I give anything I want. (user defined) ?

<field property="age" depends="required,integer,intRange">
<arg0 key="employee.age"/>
<arg1 name="intRange" key="${var:min}" resource="false"/>
<arg2 name="intRange" key="${var:max}" resource="false"/>

Thanks in Advance.

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