If you need only one light type of document now, then it is possible that
you might need another light type of document in the future.
If you add soft attributes to the Document node, then any future subtype
will inherit those attributes - somthing that may not make sense for your
new type.
As a result, you are better off making a sub type to add your attributes
and a new icon and new rules so that in the future if you ever need
another, then you are free to wither subtype your subtype, or (more
likely) make an entirely new type that isn't encumbered by the original
subtypes' attributes, icon, rules, etc.
Al
[solutions] - WTDocument Best Practice
Williams, Patrick