$portal_url/@@updateRDF

gistfile1.py

class RDFUpdater(grok.View):
    # see template in rdfupdater_templates/rdfupdater.pt
    grok.context(INavigationRoot)
    grok.name('updateRDF')
    grok.require('cmf.ManagePortal')
    def update(self):
        self.request.set('disable_border', True)
        ...