'Run over all the Inputs and ask them to Produce'

def Generate(self):

    for input in self._inputs:
        input.ProduceURLs(self.ConsumeURL)
    if len(self._set):
        self.FlushSet()
    if (not self._sitemaps):
        output.Warn('No    URLs    were    recorded,    writing    an    empty    sitemap.')
        self.FlushSet()
    if (self._sitemaps > 1):
        self.WriteIndex()
    self.NotifySearch()
    self._stat.Log()
