callback({
  "database_resource_url": "http://wedata.net/databases/xpath-feed",
  "created_at": "2011-08-09T21:23:10+09:00",
  "name": "wedata users",
  "resource_url": "http://wedata.net/items/55188?rev=77511",
  "data": {
    "link_xpath": "//div[@id=\"content\"]/ul/li/a",
    "title_xpath": "//div[@id=\"content\"]/ul/li/a",
    "body_xpath": "//div[@id=\"content\"]/ul/li",
    "url": "http://wedata.net/users/"
  },
  "updated_at": "2011-08-09T21:28:00+09:00",
  "created_by": "hinasssan"
})