Linked Open Data & Semantic Web

Linked Open Data許禮峰、蕭鈺融、方怡文

Outline

1. Linked Open Data (LOD)LOD Background

LOD Definition

LOD Star

Open Data

2. Semantic WebSemantic Web Purpose

Semantic Web Difference

3. Conclusion

4. Reference

1. LOD - Background

Name: Apple Name: Apple

1. LOD - Background

Name: Apple Name: Apple

Description: Notebook Description: Fruit

LOD Definition

URI (Uniform Resource Identifier)URL (locator)URN (name)

LOD Definition

Tim Berners Lee’s 4 Rules

1. Use URIs to denote things.2. Use HTTP URIs so that these things can be

referred to and looked up ("dereferenced") by people and user agents.

3. Provide useful information about the thing when its URI is dereferenced, leveraging standards such as RDF, SPARQL.

4. Include links to other related things (using their URIs) when publishing data on the Web.

LOD Definition

LOD Star

☆ Publish data on the Web in any format (e.g., PDF, JPEG) accompanied by an explicit Open License (expression of rights).

☆☆ Publish structured data on the Web in a machine-readable format (e.g., XML EXCEL).

☆☆☆ Publish structured data on the Web in a documented, non-proprietary data format (e.g., CSV, KML).

☆☆☆☆ Publish structured data on the Web as RDF (eg Turtle, RDFa, JSON-LD, SPARQL)

☆☆☆☆☆ In your RDF, have the identifiers be links (URLs) to useful data sources.

LOD Star-1

LOD Star-2

LOD Star-3

LOD Star-4

LOD Star-5

Open Data

Without Permission

Without License

Open Data

Open Data - I Culture

Open Data - Taipei

Open Data – g0v

Open Data - Extension

https://github.com/bee040811/IcultureOpenData

2. Semantic Web

Tim Berners Lee

Semantic Web - Purpose

Find, Share, and Combine information more easily.

The semantic web is a vision of information that can be readily interpreted by machines

Machines can perform more of the tedious work involved in finding, combining, and acting upon information on the web

Semantic Web - Difference

3. Conclusion

Machine readable

Links to your data and search engine indices can increase the visibility of your data

Structured data can be interlinked and become more useful

4. References

1. Linked Open DataWiki： http://en.wikipedia.org/wiki/Linked_data

W3C： http://www.w3.org/TR/ld-glossary/

2. Open DataI Culture： http://cloud.culture.tw/opendata/

Taipei ： http://data.taipei.gov.tw/

g0v ： http://data.g0v.tw/

Q&A

THE END