Validate one or all fields in a group
Sometimes you may want the user to successfully complete one field or another (or more generally: one part of the form or another), and don't really care which one is entered, as long as one of them are valid.
By grouping fields with a div or a fieldset and
adding the class name validate_any, the form will pass
validation as long as one of the fields inside the block passes validation.
...
Note: You may change the class name to use on the block
element through v2.html.validateAnyClass. More on configuring Validatious
Example
The following form asks for a name and a phone number. However, it's possible to enter several phone numbers should you want to. We don't really care which one the user enters, as long as she enters atleast one phone number.