[Zope-CMF] get the "real portal root url"

[Jan Torben Heuer]

&dtml-portal-url; gives me the virtual url of my Portal-root, however I need 
the real zope url (not changed by SiteAccess).

Any hints? I found a script at zopelags, a simple python script stored 
somewhere which returns the container. Is there a better way?

JT
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