Sematic Web & Knowledge Graph

By Prof. Christophe Roche; KETRC, LCU; 14th Nov. ,2019

Table of Contents

• Society of Information & Knowledge Graph
• Building KG
  • Resource Description Framework
  • Definitions
  • Vocabularies
• Querying KG
  • SPARQL
• Exercises

Def of…

IoT:

Digital devices & objects that connect automatically without human-human interaction.

KG:

Knowledge in a machine readable form

RDF Resource Description Framework 资源描述框架

什么是什么

RDFS 资源描述框架定义集

Differences between RDF & RDFS

RDF - Properties - 属性

RDFS - Domain & range - 领域和范围

FOAF Friend of a friend

​ a machine-readable ontology describing persons, their activities and their relations to other people and objects. Anyone can use FOAF to describe themself. FOAF allows groups of people to describe social networks without the need for a centralised database.

SKOS 简单知识组织系统 Simple Knowledge Organization System

URL Universal Resources Location

URI Universal Resources Identifier 统一资源标识符

URN Universal Res. Name

IRI Internationalized …

字典 - 本体 - 术语

EDM :Entity Data Model 实体数据模型

前加问号代表一个变量

Example: looking for representations of Mozart in France National Lib

• Looking for resources which are humans

• ?x is-a Person

Query Patterns

ontoterminology - Ontology and Terminology

References

PREFIX foaf: http://xmlns.com/foaf/0.1/
PREFIX owl: http://www.w3.org/2002/07/owl#
PREFIX rdfs: http://www.w3.org/2000/01/rdf-schema#
PREFIX owl: http://www.w3.org/2002/07/owl#
PREFIX bibo: http://purl.org/ontology/bibo/
PREFIX dc: http://purl.org/dc/elements/1.1/
PREFIX dcterms: http://purl.org/dc/terms/