OAI-ORE Thoughts on Compound Documents

The Technical Committee and Liaison Group of the OAI Object Reuse and Exchange effort met last week in New York City to hammer out face-to-face some of the last remaining issues before work could begin on a draft specifications document. In preparation for that meeting, we worked on a white paper that is officially called “Compound Information Objects: The OAI-ORE Perspective” — but it might more accurately be called “Thoughts on Compound Documents”. The outline of the white paper looks like this:

  1. Introduction and Motivation
  2. An OAI-ORE Interoperability Layer for Compound Objects
  3. Exposing Logical Boundaries in the Web Graph

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

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”).