title: Scrapy: Define items dynamically
body: <p>As I started to learn scrapy, i have come accross a requirement to dynamically build the Item attributes. I'm just scraping a webpage which has a table structure and I wanted to form the item and field attributes while crawling. I have gone through this example <a href="https://stackoverflow.com/questions/5069416/scrapy-scraping-data-without-having-to-explicitly-define-each-field-to-be-scra">Scraping data without having to explicitly define each field to be scraped</a> but couldn't make much of it. </p>
  
  <p>Should I be writing an item pipleline to capture the info dynamically. I have also looked at Item loader function, but if anyone can explain in detail, it will be really helpful.</p>