Hospitality Upgrade has published two articles that provide a simple introduction to Attribute Based Shopping and its promise and peril for hotels:

Starting with key concepts:

https://www.hospitalityupgrade.com/_magazine/MagazineArticles/AttributebasedShoppingTheMarketersBestFrenemy.asp/

And then with more detailed follow up:

https://www.hospitalityupgrade.com/_magazine/MagazineArticles/AttributebasedShoppingKeyStepsIntheJourney.asp/lkdjklfjrekljfl

Both authored by Hudson Crossing's Max Rayner building on prior posts by George Roukas, we recommend them highly to anybody interested in the future of travel shopping.