Harith Alani , Sanghee Kim , David E . Millard , Mark J . Weal , Wendy Hall , Paul H . Lewis , and Nigel R . Shadbolt , " "" Automatic OntologyBased Knowledge Extraction from Web Documents "" Intelligent Systems ", IEEE , Volume 18 , Issue 1 , 14 - 21 , Jan - Feb 2003 Janara Christensen , Mausam , Stephen Soderland and Oren Etzioni , " "" Semantic Role Labeling for Open Information Extraction """, FAM - LbR ' 10 Proceedings of the NAACL HLT 2010 First International Workshop on Formalisms and Methodology for Learning by Reading 52 - 60 .