Media type: E-Article Title: Web Reasoning and Rule Systems: SILK: Higher Level Rules with Defaults and Semantic Scalability Contributor: Grosof, Benjamin N. imprint: Springer Berlin Heidelberg, 2009 Published in: Web Reasoning and Rule Systems Language: Not determined DOI: 10.1007/978-3-642-05082-4_2 ISSN: 1611-3349; 0302-9743 Origination: Footnote: