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Yaşar Tonta & Orçun Madran [yasartonta, Hacettepe University

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Presentation on theme: "Yaşar Tonta & Orçun Madran [yasartonta, Hacettepe University"— Presentation transcript:

1 BBY 464 Semantic Information Management (Spring 2016) URIs, XML and XML Schema
Yaşar Tonta & Orçun Madran [yasartonta, Hacettepe University Department of Information Management

2 Semantic Web

3 From Syntactic to Semantic Interoperability

4 Applications of representation of metadata
Card index (DC) Privacy info (P3P) IPR labeling (PICS labels) Schema layer DTDs Needed to check if elements are used in appropriate places Conversion languages

5 Logical layer: Different databases talking to each other

6 URIs

7 URIs Cool URIs don’t change https://www.w3.org/Provider/Style/URI
“URIs don’t change; people change them” Why do they get changed? Designing persistent URIs How about Would it still work?

8 URLs

9 IRIs What is the difference between IRIs and URIs?
URIs use ASCII whereas IRIs use Universal Character Set (UTF-8 character encoding, accounting for 86.4% of all Web pages as of January 2016) What does that mean?

10 XML Human- and machine-readable markup language
Simple, general, usable Document formats using XML: RSS, Atom, SOAP, XHTML . .

11 Document Type Definitions (DTDs)
DTDs are the most widely supported schema language for XML Syntax

12 HTML 4.01 DTDs

13 XHTML 1.1 DTD (most current version)

14 XML Markup Languages

15 HTML5 DTD-less DOCTYPE HTML5 uses a DOCTYPE declaration which is very short, due to its lack of references to a DTD in the form of a URL or FPI. All it contains is the tag name of the root element of the document, HTML.[5] In the words of the specification draft itself: In other words, <!DOCTYPE html>, case-insensitively.

16 XML Schema Schema: an abstract collection of metadata consisting of a set of schema components (ie, element and attribute declarations) XML Schema specifies how to formally describe the elements in an XML document XML Schema is one of several XML schema languages

17

18 Graphical representation of a schema

19 XML document conforming to this schema

20 List of XML schemas BeerXML

21 Assignment http://www.acikders.net/mod/page/view.php?id=1814
Due next week

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