Tag Archives: RDF

Thursday Threads: RDF, Digital Document Tampering, and Amazon’s Mechanical Turk

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This is definitely becoming a habit…welcome to the fourth edition of DLTJ‘s Thursday Threads. If you find these interesting and useful, you might want to add the Thursday Threads RSS Feed to your feed reader or subscribe to e-mail delivery using the form to the left. If you would like a more raw and immediate version of these types of stories, watch my FriendFeed stream (or subscribe to its feed in your feed reader). Comments, as always, are welcome.

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Specifications for Object Reuse and Exchange (ORE) published

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ORE Logo The first production version of the Object Reuse and Exchange from the Open Archives Initiative was published today. In the words of the release announcement, ORE provides “the foundation for applications and services that can visualize, preserve, transfer, summarize, and improve access to the aggregations that people use in their daily Web interaction: including multiple page Web documents, multiple format documents in institutional repositories, scholarly data sets, and online photo and music collections.”

This is a preview of Specifications for Object Reuse and Exchange (ORE) published. Read the full post (148 words, 1 image, 36 seconds estimated reading time)

“Object Reuse and Exchange” Beta Specifications Now Available

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Carl Lagoze of Cornell University and Herbert Van de Sompel of Los Alamos National Laboratory announced the release of the beta form of the ORE specifications yesterday. Here is the full text of their announcement:

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Would the Real “Dublin Core” Please Stand Up?

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I’ve been following the discussion by Stu Weibel on his blog about the relationship between Resource Description Framework (RDF) and Dublin Core Abstract Model (DCAM), and I think I’m as confused as ever. It comes as a two part posting with comments by Andy Powell Pete Johnston (apologies, Pete), Mikael Nilsson, Jonathan Rochkind, and Ed Summers. Jonathan’s and Ed’s comments describe the same knowledge black hole that I’ve been facing as well; in Ed’s words: “The vocabulary I get–the DCAM is a tougher nut for me to crack.”

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Presentation Summary: “Cross-Repository Semantic Interoperability: the MIT SIMILE Project”

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Richard Rodgers presented this talk based on the work of he and MacKenzie Smith in the Digital Library Research Group at MIT. The original abstract of the presentation was:

Many questions are raised as previously unreachable digital content is found in and among new repositories–is each repository an island or a separately searchable resource? SIMILE (Semantic Interoperability of Metadata and Information in Unlike Environments) has developed an extensive ‘tool chain’ for gathering and manipulating data assets. Richard Rodgers and MacKenzie Smith, MIT, will demonstrate how tools developed by the SIMILE project can be used as powerful instruments for the federation, discovery, exploration, and curation of metadata.

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Presentation Summary: “MPTStore: Implementing a fast, scalable, and stable RDBMS-backed triplestore for Fedora and the NSDL”

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Chris Wilper gave this presentation on behalf of the work that he and Aaron Birkland did to improve the performance of the Fedora Resource Index.

Version 2.0 of the Fedora digital object repository software added a feature called the Resource Index (RI). Based on Resource Description Framework (RDF) triples, the RI provided quick access to relationships between objects as well as to the descriptive elements of the object itself. After about two years of use using the Kowari software, the RI has pointed to a number of challenges for “triplestores”: scalability (few triplestores are designed for greater than 100 million triples); performance; and stability (frequent “rebuilds”).

This is a preview of Presentation Summary: “MPTStore: Implementing a fast, scalable, and stable RDBMS-backed triplestore for Fedora and the NSDL”. Read the full post (593 words, 2:22 minutes estimated reading time)

Representing Collections In FEDORA

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One of the DRC developers had a question recently that sparked a discussion about what to do with collections of objects. In order to answer the question of how to represent the notion of a collection within the repository, we’re going to have to get pretty heavy into RDF: the Resource Description Framework. RDF is a language created by the Worldwide Web Consortium “for representing information about resources in the World Wide Web.” If you already know about RDF — or just want to see what a proposed solution is — you can skip down to the “RDF for Collections in FEDORA” heading.

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