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Semantic Web Technologies. Brief Readings Discussion Class work: Research topics and Project discussion Research Presentation Topics assigned Building lightweight semantics. What are Lightweight Semantics?.

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Semantic web technologies
Semantic Web Technologies

  • Brief Readings Discussion

  • Class work: Research topics and Project discussion

  • Research Presentation Topics assigned

  • Building lightweight semantics

What are lightweight semantics
What are Lightweight Semantics?

  • The bottom-up, user created, context-driven set of markup conventions (not standards) that can be used to provide associative metadata in human readable formats

  • Metadata

    • For music

    • For your Web browsing

    • For your documents

  • Microformats

  • Emergent Semantics

Taking a stand on the sem web
Taking a Stand on the Sem Web

  • Can the semantic Web scale?

    • Can there be enough agreement for true sharing?

    • How much can be predicted based on current use?

  • Should the semantic Web be like MARC records?

    • What about MARC-up consistency?

      • Training & standards

    • Who is the LoC or OCLC in the Sem Web?

    • Are Web Services & APIs like Z39.50?

  • Semantic SPAM?

    • Web of Trust

Stand for lightweight semantics
Stand for Lightweight Semantics?

  • “any underlying assumptions about use are highly situated”

    • Does this imply that only experts should tag things?

  • But the algorithms & heuristics are assembled by experts right?

  • How do you embed good semantics?

    • At time of use?

    • In the creation system?

  • Is all this tagging at the cost of the user?

    • Time to tag, time for finding

    • But what if I organize my own data as well?

  • Why can’t the SW experts be the same people as the MARC experts?


  • “Designed for humans first and machines second, microformats are a set of simple, open data formats built upon existing and widely adopted standards. Instead of throwing away what works today, microformats intend to solve simpler problems first by adapting to current behaviors and usage patterns (e.g. XHTML, blogging).”

  • Let’s go to the site


  • A combination of elemental formats that work with compound formats

  • Some are standards, some are becoming standards through use

Lightweight mark up
Lightweight Mark-Up

  • Markup for accessibility helps with the Semantic Web

  • Validating markup helps build the Semantic Web

  • “Semantic Overhead” during Web page creation

  • Use simple semantics for context

    • Class

    • Id

    • Meta tags

  • A set of tools to help

  • This is an example of a paper to build from for a research presentation

Emergent semantics
Emergent Semantics

  • Ad hoc semantics

  • Use known markup formats (XHTML) for representing your structures

    • Like using CSS to control display

    • Easier to read than some semantic (meta) data

    • “rel” values

  • Easily transformed for more structured use?

    • Working with APIs

  • Eric Meyer’s presentation

Let s use some microformats
Let’s use some microformats

  • Build some lightweight markup to describe your friendships

  • The hard way:

    • <a href="" rel="friend met colleague neighbor">Don Turnbull</a>

  • The easy way:

Let s talk about topics
Let’s talk about topics

  • Discuss your topic ideas with your new XFN friend

  • What are the basic ideas that apply to the Semantic Web, Web 2.0, Web Services, or Lightweight Semantics?

  • How would you show the ideas?

    • examples

  • What do the ideas build upon?

    • research

Topic selection
Topic Selection

  • Choose a topic (and corresponding week) to overview

  • Topic Presentations should include:

    • Overview of the technology

    • Provide examples of the technology in use

    • Show how to build using the technology (examples)

    • A list of citations and readings that you drew from and for extended reference

      • Do not rely on wikipedia & blogs as your only sources

      • Academic journal & conference papers

      • Books (development or conceptual design)

  • How can these Semantic Web technologies help coordinate, discover, organize information and knowledge?

  • Your own point of view about the practicality & promise of these tools & procedures

Current list of topics
Current list of Topics

  • RDF

  • Metadata (e.g. Dublin Core, MediaRSS)

  • Ontology building (applications)

  • REST, XMLHttpRequest & AJAX

  • Greasemonkey

  • Javascript: Introduction

  • Javascript: Advanced

  • TagClouds

  • GIS, Maps & Mapping Mashups

  • XSLT

  • WordNet

  • Semantic Commerce

  • Trust