Testing a Linked Data Fragments Server using DPLA Data
Based on Ruben Verborgh Linked Data Fragments server, this session is about the latest experiments on implementing a Linked Data Fragments server as an alternative to fully supported SPARQL endpoint. This semantic web system research uses Redis as the backend datastore cache with a server prototype in Python and an initial production server being developed in the Go language. This talk will illustrate the general approach, first demonstrated in Jeremy Nelson's Pycon Japan talk in October 2015 (http://intro2libsys.info/pycon-jp-2015/) , of incrementally improving and testing a linked data fragments server that provides RDF triples in JSON when queried by web clients. This talk will show how DPLA's JSON data is transformed into raw Redis protocol for extremely fast importing of data at scale into a Redis cluster. The talk will then show how by leveraging the flexibility, speed, and caching functionality of DPLA RDF data, Redis enables a linked data fragments caching and distributed server topology that scales while offering faster and more stable retrieval of RDF triples from a sample of DPLA's RDF data. This talk finishes by comparing the performance of a new Go language-based production server versus the Python prototype and future plans for this promising technology.
PCDM, IIIF, and Interoperability
The Portland Common Data Model (PCDM) provides a flexible vocabulary for describing repository content, and aims to allow tools and applications to work with data that have varying metadata standards and levels of complexity. The International Image Interoperability Framework (IIIF) provides standard APIs for describing and delivering images, allowing implementers to develop feature-rich applications while still working with the technology of their choice, and enabling users to integrate content from multiple repositories into a single viewer. Beyond their focus on interoperability, these projects also share a pragmatic approach centered on use cases and community engagement. This talk will describe PCDM and IIIF, and draw lessons about how building community and staying grounded in real world use cases help create standards and tools that work.
