Summary: Semantic Information Systems
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Read the summary and the most important questions on Semantic Information Systems
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Knowledge at the end of the course
This is a preview. There are 2 more flashcards available for chapter 26/10/2015
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What is XML, XML DTD, XML Schema, XSLT, XQuery?
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What is RDF, RDFS, OWL, SPARQL?
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What are possible applications of the Semantic Web technologies?
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Semantic Web
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What is the problem of lack of semantics on the Web?
A typical web page has rendering information (font size, color, etc.) and hyper-links to related content.
Semantic content is accessible to humans, but not (easily) to computers.
Solution: XML Markup -> Ontology -
What is Ontology according to Gruber?
An ontology is a formal, explicit specification of a shared conceptualization.
- Conceptualization: abstract model of phenomena
- Explicit: the type of concepts and the constraints are explicitly defined
- Formal: the ontology should be machine readable
- Shared: the ontology should capture consensual knowledge accepted by the communities -
What is the Semantic Web?
The Semantic Web is an extension of the current web in which information is given well-defined meaning, better enabling computers and people to work in cooperation. (Tim Berners-Lee)
Future
- Web information has exact meaning
- Web information can be understood and processed by computers
- Computers can itegrate information from the web -
Semantic Web Layer Cake
The development of the Semantic Web proceeds in steps:
- Unicode and URI (XML + namespace + XML Schema)
- RDF and RDF Schema
- Ontology vocabulary
- Logic
- Proof
- Trust -
Entity classes (square)
Something that exists in itself. Concept. -
XML
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What is a markup language?
A method for putting structured data in a text file, while using tags to specify certain rules and used with a processing application that knows how to handle tags.
Tags are defined by the person creating the document. -
Difference between HTML and XML
HTML describes presentation, while XML describes content.
HTML is case-insensitive, while XML is case-sensitive.
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