Returns positive numbers if this is a resolver for root templates (i.e.
those at which rendering begins for a view). The highest value
of resolver priority found for a particular request will be used to
determine the template actually used to render the root.
A value of "0" indicates this template should *never* be used as a root
template.
A value of "1" is a default value given to various framework interfaces
(such as
CRITemplateResolverStrategy ) that *should in general* be
root templates.
User code should use a value of "2" or more to take priority over framework
defaults, where they want to override the default choice of root template.
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