class MySpider(CrawlSpider):
    domain_name = 'xml.example.com'

def parse(self, response):
    xxs = XmlXPathSelector(response)
items = xxs.select('//channel/item')
for i in items:
    urli = i.select('link/text()').extract()
request = Request(url=urli[0], callback=self.parse1)
yield request

def parse1(self, response):
    hxs = HtmlXPathSelector(response)
yield MyItem()
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