Knowledge Representation Representation of human knowledge is a long-standing goal of Al Various representations of facts and inference rules proposed over time RDF:Resource Description Format Simplified representation for facts,represented as triples (subject,predicate,object) E.g.,(NBA-2019,winner,Raptors) (Washington-DC,capital-of,USA) (Washington-DC,population,6,200,000) Models objects that have attributes,and relationships with other objects Like the ER model,but with a flexible schema (ID,attribute-name,value) (ID1,relationship-name,ID2) Has a natural graph representation Database System Concepts-7th Edition 8.12 ©Silberscha乜，Korth and Sudarshan
Database System Concepts - 7 8.12 ©Silberschatz, Korth and Sudarshan th Edition Knowledge Representation ▪ Representation of human knowledge is a long-standing goal of AI • Various representations of facts and inference rules proposed over time ▪ RDF: Resource Description Format • Simplified representation for facts, represented as triples (subject, predicate, object) ▪ E.g., (NBA-2019, winner, Raptors) (Washington-DC, capital-of, USA) (Washington-DC, population, 6,200,000) • Models objects that have attributes, and relationships with other objects ▪ Like the ER model, but with a flexible schema ▪ (ID, attribute-name, value) ▪ (ID1, relationship-name, ID2) • Has a natural graph representation
Graph View of RDF Data Knowledge graph Srinivasan 6500 Comp.Sci. Zhang 102 name salary dept_name name tot_cred inst dept stud dept 10101 comp_sci 00128 teaches course_dept takes CS-101 secl sec course sec_id title classroom semester year Intro.to Computer Science packard-101 Fall 2017 Database System Concepts-7th Edition 8.13 @Silberschatz,Korth and Sudarshan
Database System Concepts - 7 8.13 ©Silberschatz, Korth and Sudarshan th Edition Graph View of RDF Data ▪ Knowledge graph