attribute filter rule : permit ANY by default ?

[Tom Zeller]

Looking at the couple of attribute-filter.xml files that folks sent
me, it looks like the most common stanza is :

<AttributeRule attributeID="foo">
   <PermitValueRule xsi:type="basic:ANY" />
</AttributeRule>

which makes me think that a default permit any value rule would
shorten configurations, so instead :

 <AttributeRule attributeID="foo" />

I do understand that someone might smack me for suggesting a default
permit any rule. Smack away...