Custom validator with attributes in facelets

Question

I have written a custom Validator that expects an attribute to be set. I know I have to write a Handler (TagHandler or ValidatorHandler?) to set that attribute, but I am having trouble doing it.

<tag>
    <tag-name>validateCustom</tag-name>
    <validator>
        <validator-id>package.CUSTOM_VALIDATOR</validator-id>
    </validator>
</tag>

Where do i put the handler-class element? And how do I write the handler so that it will pass the attributes to my custom validator?

Thanks in advance!