Scrapy XML文档

Question

我刚认识Python和scrapy。我试图从多个XML文档中提取数据。我在这里找到了XML，它们的范围从<strong>CourseId=1</strong>一直到<strong>CourseID=4500</strong>：

示例1：     http://www.myskills.gov.au/DesktopModules/Services/api/RegisteredTrainers/GetOfferedTrainers?LocationID=0&Distance=25&IsExplicit=false&CourseId=1

示例1：

http://www.myskills.gov.au/DesktopModules/Services/api/RegisteredTrainers/GetOfferedTrainers?LocationID=0&Distance=25&IsExplicit=false&CourseId=2

我的scrapy代码如下。当我运行它时，我得到一个TypeError: unbound method body_as_unicode() must be called with the XMLResonse instance as first argument。

from scrapy.contrib.spiders import CrawlSpider,Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.selector import XmlXPathSelector
from myProject.items import RTOData
from scrapy.http import Request
from scrapy.http import XmlResponse


class myProjectSpider(CrawlSpider):
    name = 'myProject'
    allowed_domains = ['myskills.gov.au']
    start_urls =     ['http://www.myskills.gov.au/DesktopModules/Services/api/RegisteredTrainers/GetOfferedTrainers?LocationID=0&Distance=25&IsExplicit=false&CourseId=1']

    def parse_start_url(self, response):
     x = XmlXPathSelector(XmlResponse)
     Latitude = x.select('//ArrayOfRegisteredTrainerLocationOfferedItem/RegisteredTrainerLocationOfferedItem/Latitude').extract()
     Longitude = x.select('//ArrayOfRegisteredTrainerLocationOfferedItem/RegisteredTrainerLocationOfferedItem/Longitude').extract()
     RTOCode = x.select('//ArrayOfRegisteredTrainerLocationOfferedItem/RegisteredTrainerLocationOfferedItem/RTOCode').extract()
     SiteName = x.select('//ArrayOfRegisteredTrainerLocationOfferedItem/RegisteredTrainerLocationOfferedItem/SiteName').extract()

有人可以告诉我，我是否在正确的道路上？