1. Questioning Authority Gem and Linked Data
E. Lynette Rayle
Cornell University
LD4L Labs
November 2016

2. Extending Questioning Authority

3. Usage of Linked Data by Apps
Context: Sufia app
Goals:
get a list of terms matching search criteria that allows for a list of terms to autocomplete a metadata field
upon selection, store the URI as the value of the metadata field
cache the label for performance
get more linked data about a term to link out to other resources from the resource show page

4. Ontologies Configured in QA Fork
Included in forked QA:
OCLC Fast Linked Data
Library of Congress
FAO-ArgroVoc (United Nation's Food and Agriculture Organization)

5. Two Approaches Term Search Term Fetch
returns multiple terms based on a query
limited set of predicates returned with each result
Term Fetch
returns triples for a single term
much broader set of predicates returned

6. Configuring Term Search Minimal Configuration
search: url: ?query=cql.any+all+%22__QUERY__%22 &sortKeys=usage &maximumRecords=10 http_accept: application/rdf+xml replacement_count: 0

7. Configuring Term Search Configuration with Replacements
search: url: ?query=cql.any+all+%22__QUERY__%22 &sortKeys=usage &maximumRecords=__MAX_RECORDS__ http_accept: application/rdf+xml replacement_count: 1 replacement_1: param: maximumRecords pattern: __MAX_RECORDS__ default: "20"

8. Configuring Term Search Configuration with Sub-authorities
search: url: ?query=__SUB_AUTH__+all+%22__QUERY__%22 &sortKeys=usage &maximumRecords=__MAX_RECORDS__ ... subauthorities: replacement: pattern: __SUB_AUTH__ default: "cql.any" topic: oclc.topic geographic: oclc.geographic event_name: oclc.eventName personal_name: oclc.personalName corporate_name: oclc.corporateName

9. Demo
access QA through app

10. SEARCH RESULTS within Authority
Cornell&maximumRecords=3 [{"uri":" "id":"530369", "label":"Cornell University"}, {"uri":" "id":"5140", "label":"Cornell, Joseph"}, {"uri":" "id":"557490", "label":"New York State School of Industrial and Labor Relations"}]

11. SEARCH RESULTS within Sub-authority
rsonal_name?q=Cornell&maximumRecords=3 [{"uri":" "id":"5140", "label":"Cornell, Joseph"}, {"uri":" "id":"72456", "label":"Cornell, Sarah Maria, "}, {"uri":" "id":"409667", "label":"Cornell, Ezra, "}]

12. Configuring Linked Data field
property :keyword_uri, predicate: ::RDF::URI.new(' ), multiple: false property :keyword, predicate: ::RDF::URI.new(' multiple: false do |index| index.as :stored_searchable, :facetable end

13. Auto complete Show page links
Demo
Auto complete Show page links

14. Challenges Connecting to Linked Data Sources

15. Access Challenges Inconsistent mechanism for accessing authorities
content negotiation returning RDF (preferred)
parameterized – search terms, return count, etc.
post document – DBpedia requires an xml query document
SPARQL queries (potential)
Restrictions on accessing authorities
pre-registration of username (GeoNames)
login with content negotiation (GeoNames, Fedora)
limited number of queries allowed (LoC)

16. Usage Challenges User selection challenges
Quantity of matching results are often large.
Linked data graphs do not have order.
How to provide additional information for user selection?
Exacerbated if data comes from multiple linked data sources.
How to surface rich linked data through the UI?

17. Continuing Work

18. Open Work QA LDF sorting query results by identified predicate
adding additional information to query results
configure getting a single term from LDF
configure getting terms via query from LDF
requires all terms from source to be downloaded to LDF TS
requires identification of URL syntax for passing SPARQL query
LDF
requirements for cache refresh
support for cache refresh in Marmotta and/or BlazeGraph
configure Marmotta
implementation in BlazeGraph

19. Open Work (Continued) Hydra Editor Leverage relationships
linked data type
two fields in form: 1) label (visible), 2) uri (hidden)
save behavior?: 1) label saved to solr, 2) uri saved to fedora
reusable javascript for auto-complete built in to gem
Leverage relationships
broader, narrower, same as, etc.
UIs that can leverage linked data
Apply query across multiple authorities

20. Discussion