Chapter 1 The semantic Web vision Grigoris Antoniou Frank van Harmelen 1 Chapter 1 A Semantic Web Primer
1 Chapter 1 A Semantic Web Primer Chapter 1 The Semantic Web Vision Grigoris Antoniou Frank van Harmelen
Lecture Outline Today's Web 2. The Semantic Web Impact 3. Semantic Web Technologies 4. A Layered Approach Chapter 1 A Semantic Web primer
2 Chapter 1 A Semantic Web Primer Lecture Outline 1. Today’s Web 2. The Semantic Web Impact 3. Semantic Web Technologies 4. A Layered Approach
Today's Web Most of today's Web content is suitable for human consumption Even Web content that is generated automatically from databases is usually presented without the original structural information found in databases Typical Web uses today people's seeking and making use of information, searching for and getting in touch with other people, reviewing catalogs of online stores and ordering products by filling out forms 3 Chapter 1 A Semantic Web primer
3 Chapter 1 A Semantic Web Primer Today’s Web ⚫ Most of today’s Web content is suitable for human consumption – Even Web content that is generated automatically from databases is usually presented without the original structural information found in databases ⚫ Typical Web uses today people’s – seeking and making use of information, searching for and getting in touch with other people, reviewing catalogs of online stores and ordering products by filling out forms
Keyword-Based Search Engines Current Web activities are not particularly well supported by software tools Except for keyword-based search engines(e.g Google, AltaVista, Yahoo) o The Web would not have been the huge success it was, were it not for search engines Chapter 1 A Semantic Web primer
4 Chapter 1 A Semantic Web Primer Keyword-Based Search Engines ⚫ Current Web activities are not particularly well supported by software tools – Except for keyword-based search engines (e.g. Google, AltaVista, Yahoo) ⚫ The Web would not have been the huge success it was, were it not for search engines
Problems of Keyword-Based Search Engines o High recall, low precision ow or no recall o Results are highly sensitive to vocabulary Results are sing le Web pages Human involvement is necessary to interpret and combine results o Results of Web searches are not readily accessible by other software tools 5 Chapter 1 A Semantic Web primer
5 Chapter 1 A Semantic Web Primer Problems of Keyword-Based Search Engines ⚫ High recall, low precision. ⚫ Low or no recall ⚫ Results are highly sensitive to vocabulary ⚫ Results are single Web pages ⚫ Human involvement is necessary to interpret and combine results ⚫ Results of Web searches are not readily accessible by other software tools