[Zope] How to restrict the rendering of public methods?

[Ausum]

Is it possible to restrict a method to be rendered only by another method? For
example, what if we don't want "standard_html_header" to be rendered by itself? 

Currently, typing "(path)/standard_html_header", in example, renders the
correspondant part of the page, because that method is already supossed to be
permitted to view to all users, due the methods who would use it (like
index_html) will inherit that permission.

But, what if this turns out to be a security issue? Is it possible to turn all
methods to be "system-callable-not-rendereable only", unless specified?



Thanks in advance,



Ausum