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