Web Scrapping for specific content

Web Scrapping for specific content

I am trying to scrap content from shopping sites then save it on my
database in table Product. Scrapping such content require to know the DOM
structure of each site. Not only DOM Structure, but also the hierarchy of
categories in the menu.
There are many solutions to achieve that by setup a configuration for each
site,Then look for specific html elements that contains (ex product name,
price ,model,...) using regx , XPath or css selectors.
Is There any solution to avoid setup configuration for each site and scrap
the product properties automatically?
There is a similar solutions that deal with news like Readability which
looks for sequence of <p> tag and images. It is easier for news due the
similarity between news site and the simple structure,