Persistent Identifiers for the "Real Web" The Real Web

Transcription

1 Persistent Identifiers for the "Real Web" David Wood Eric Miller 1 The Real Web 2 Page 1

2 The Real Web You Me The conference Your laptop 2 3 Page 2

3 cover is a Moby Dick 3 cover is a Moby Dick has author depiction Herman Melville 3 Page 3

4 cover is a Moby Dick has author depiction Herman Melville cover is a Moby Dick has author depiction Herman Melville 1851 Moby Dick title adapted to Films title The Sea Beast Page 4

5 cover is a Moby Dick has author depiction Herman Melville 1851 Moby Dick title adapted to Films title The Sea Beast soundtrack poster We (almost) do this on the World Wide Web 4 Page 5

6 5 A History of Silos $ cat foo.txt grep blah sort 1970s 1980s 1990s A neat little package Client-Server The Early Web 6 Page 6

7 The Next Great Leap 7 The Next Great Leap Extending the Universal Client Ubiquitous, reusable applications Expanding the Universal Connection Web of Data 7 Page 7

8 The Next Great Leap Extending the Universal Client Ubiquitous, reusable applications Expanding the Universal Connection Web of Data 7 The Next Great Leap Extending the Universal Client Ubiquitous, reusable applications Expanding the Universal Connection Web of Data Providing the Universal Database 7 Page 8

9 The Next Great Leap Extending the Universal Client Ubiquitous, reusable applications Expanding the Universal Connection Explaining the Logic Web of Data Providing the Universal Database 7 The Next Great Leap Extending the Universal Client URL Curation Expanding the Universal Connection Explaining the Logic Web of Data Providing the Universal Database 7 Page 9

10 PURLs PURLs provide permanent URLs for information resources on the World Wide Web. PURLs work by simple HTTP redirection. 8 PURLs The Online Computer Library Center (OCLC) has run a public PURL service since 1995 at Used by others for private PURL services (libraries, Internet namespaces, government, some corporations). Open Source, open standards. 9 Page 10

11 Evolution One PURL Change in Host Change in Hosting Organization 10 PURLs You might already be using PURLs: Mediawiki has a shorthand syntax for PURLs. [[purlnet:scape]] 11 Page 11

12 Example: Find an information resource PURL server I want to find Dave s blog 12 Example: Find an information resource PURL server No problem, go to 13 Page 12

13 Simple Redirection GET PURL Client HTTP 302 Found URL GET URL Resource PURL Server Resource Server 14 Other Persistent Identifier Schemes Scheme DOI LSID INFO URIs PURLs Community Publishers Life sciences Libraries, publishers Libraries, government 15 Page 13

14 Scaling Use of URIs as identifiers grounds your scheme into the Web. - PURLs do this - DOIs and INFOs partially do - LSIDs don t. 16 Problems and Solutions PURLs provide one level of indirection, just like a single value DOI name - Not any more. PURL servers don't know about each other - Federation coming soon. 17 Page 14

15 PURLs for Real-World Resources Zepheira and OCLC rewrote the PURL server from scratch to: - Modernize the code - Create a wider Open Source community - Add some new features We have a particular interest in supporting permanent Semantic Web URIs. 18 PURLs for Real-World Resources The new PURL server allows the creation of PURLs with these HTTP responses: 301 Moved Permanently 302 Found 303 See Other 307 Temporary Redirect 404 Not Found 410 Gone 19 Page 15

16 PURLs for Real-World Resources The new PURL server allows the creation of PURLs with these HTTP responses: 301 Moved Permanently 302 Found 303 See Other 307 Temporary Redirect 404 Not Found 410 Gone 20 PURLs for Real-World Resources The new PURL server allows the creation of PURLs with these HTTP responses: 303 See Other Used to identify physical and conceptual resources 21 Page 16

17 PURLs for Real-World Resources GET PURL Client HTTP 303 See Also URL PURL Server Client may choose to follow the link This allows clients to automatically resolve Semantic Web identifiers without confusing them with information resources. 22 Example: Resolve a conceptual resource PURL server I want to find out about Moby Dick 23 Page 17

18 Example: Resolve a conceptual resource PURL server 1) Moby Dick is a concept, not a particular information resource. 2) You may find out more about it at Page 18

19 26 27 Page 19

20 Best Practices: Baby Steps Identify resources by URIs. Use See Also PURLs to ensure crossboundary data integrity. Don t reinvent the wheel: Reuse common public and partner URIs before minting your own. 28 Best Practices: Next Steps Share a PURL service or use more than one. Coordinate at the information space level, not the code or even API levels. Local control, global access. 29 Page 20

21 Running and Leaping Experiment with Active PURLs. An Active PURL participates in the provision of metadata about resources it represents. Come talk to us later. 30 PURL Community Documentation, source code, mailing lists See also: Persistent_Uniform_Resource_Locator 31 Page 21