'Find the specified location in the store.
@param location: The I{location} part of a URL.
@type location: str
@return: An input stream to the document.
@rtype: StringIO'

def find(self, location):

    try:
        content = self.store[location]
        return StringIO(content)
    except:
        reason = ('location    "%s"    not    in    document    store' % location)
        raise Exception, reason
