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FSS Utility
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FSSUtility is an utility to replace the old FFSTool.

Some inits::

    >>> from iw.fss.interfaces import IStrategy

Get the utility::

    >>> from zope.component import getUtility
    >>> from iw.fss.interfaces import IConf
    >>> getUtility(IConf, "globalconf")
    <class 'iw.fss.conffile.ConfFile'>

Call the global configuration method::

     >>> conf= getUtility(IConf, "globalconf")
     >>> conf = conf()
     >>> conf.rdfEnabled
     False

Get the strategy with the context::

    >>> conf.getStorageStrategy().__class__ == strategy_klass
    True
