Knowledge rich The other extreme Web log mining User sessions Markov models But, sometimes data about specific pages are sparse Cannot train the markov models properly a single visitor views w0% of any site New dynamic content not in training data Now, many pages are generated automatically Deep web Dynamically generated pages Question: if we have the relational knowledge, what more can we do? 2021/1/26 122021/1/26 12 Knowledge Rich: The other extreme ◼ Web log mining ◼ User sessions ◼ Markov models ◼ But, sometimes data about specific pages are sparse! ◼ Cannot train the Markov models properly ◼ A single visitor views ~0% of any site ◼ New & dynamic content not in training data ◼ Now, many pages are generated automatically ◼ Deep web ◼ Dynamically generated pages ◼ Question: if we have the relational knowledge, what more can we do?