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Applied Linked Data Call 2015-04-29

Applied Linked Data Call 2015-04-29

Jun 16, 2017

Attendees:

  • Steven Anderson (Boston Public Library)

  • Trey Terrel (Oregon State University)

  • Corey Harper (New York University)

  • Andy Weidner (University of Houston)

  • Justin Coyne (Data Curation Experts)

 

New Meeting Time:

  • 9am Pacific, 12 Eastern -- Thursdays (Every other -- Still Off-Weeks of Hydra Metadata WG)

 

Caching Discussion    

  •  Sidecar. Does LDF apply to this. 

    • Oregon Digital uses MongoDB. 

    • Justin uses Marmotta

  • How to Cache?

    • Marmotta Option: Builtin Caching Logic

    • LDF Server as Vocab Repo. Processes Triple Pattern Frags

    • Question of how to do Cache Invalidation. Current approach just refreshes after 30 days.

    • Linked Data Fragments option would still have to require Marmotta or MongoDB or some other caching mechanism behind it.

      • Does allow a place to put configuration for the caching though.

      • Does make it easier to swap out the caching implementation.

      • Question on if we need to implement all of a Linked Data Fragments interface. We may only care about it being given a subject rather than supporting resolution of all parts of the triple.

      • Oregon Digital also needs geo-lookup (return Lat/Long) beyond just labels.

    • Mention of Stanbol but unsure exactly how it works. Previously sent link on details: https://stanbol.apache.org/docs/trunk/customvocabulary.html (Amherst has implemented it)

 

Timelines for a Linked Data Fragments Sprint

  • June 8th - June 19th (conflicts with Open Repositories though)

  • June 15th - 26th (conflicts with one of the members being on vacation for the 2nd week).

  • Main advantages of this work for our applications:  easier configuration of caching invalidation rules and switching out the caching backend.
     

Indexing Problem

  • Local Solr Reflections of what's in your cache

  • Current: On save, retrieves asset from cache & save to solr

  • Option 1: If you find a linked data element has changed, find the different objects with that reference & reindex


Alt Labels Searching and broader / narrower SKOS concepts 

  • For alt labels, could just pull it with the normal label into a single multi-valued solr field. Then could return results from "Boston" based on a search of the alternate label "Beantown".

  • For broader / narrower, would be cool to be able to get those on a search. Not sure on the implementation and pushed off to the next call.


Stored Field default in Hydra

  • Open an issue in Active-Fedora or Hydra-Jetty (likely Active Fedora).

  • Keywords that don't use storable in Hydra indexing: Facetable and Searchable. Would want to remove these from the Solr config rather than change them.

  • There is a stored searchable one that will do it as a stored field. Would need to check to ensure there is a stored facetable option (may need to have it added). Seems like it may be equivalent to :symbol.