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These RDF files were produced during the LD4L project. They are all available on the server for http://draft.ld4l.org/downloads/.

Panel

Table of Contents

RDF Files

available for download as described below.

Table of Contents

Converter output

The MARC records from each library were converted to BIBFRAME 1.0 RDF by the the Library of Congress mar2bibframe converter . LD4L's bib2lod converter was  was then used to produce RDF in the LD4L data model. The result is RDF in the the N-Triples format format. These dumps are available:

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These data files are available:

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These files are available:

Linked data blobs

The linked data at draft.ld4l.org is served by a Sinatra application, reading from a MySQL database. The database looks like this:

Code Block
languagetext
mysql> use ld4l;
Database changed

mysql> show tables;
+----------------+
| Tables_in_ld4l |
+----------------+
| lod            |
+----------------+

mysql> describe lod;
+-------+--------------+------+-----+---------+-------+
| Field | Type         | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| uri   | varchar(200) | NO   | PRI | NULL    |       |
| rdf   | mediumblob   | NO   |     | NULL    |       |
+-------+--------------+------+-----+---------+-------+

 

'uri' corresponds to the uri of the requested linked data:

Code Block
languagetext
mysql> select uri from lod where uri like 'http%' limit 5;
+---------------------------------------------------------------------+
| uri                                                                 |
+---------------------------------------------------------------------+
| http://draft.ld4l.org/                                              |
| http://draft.ld4l.org/cornell                                       |
| http://draft.ld4l.org/cornell/n000000d1-1ab5-4fc0-a33f-2fb4204eddb4 |
| http://draft.ld4l.org/cornell/n000000e4-e1cd-4fbb-872c-01456a8a8396 |
| http://draft.ld4l.org/cornell/n00000118-f2b5-4005-b20e-65e09af06a2a |
+---------------------------------------------------------------------+

 

'rdf' is the data that will be served, in Turtle format, zipped. As such, it is not readable until unzipped:

Code Block
languagetext
mysql> select substring(rdf, 1, 70) from lod where uri = "http://draft.ld4l.org/";
+------------------------------------------------------------------------+
| substring(rdf, 1, 70)                                                  |
+------------------------------------------------------------------------+
F?&D}??(I?R<p?st?6D?(?P?Dj3t?.?V
?N$!ϥsM?G?? |
+------------------------------------------------------------------------+
 

These dumps are available:

Solr index capture

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Search
Anchor
search
search

The project developed an experimental search service based on the converted data above. The application code is available from github (https://github.com/ld4l/ld4l_blacklight_search) and is built on Blacklight. Blacklight is a Rails app that includes a Solr search engine .The and the structure of the search index is determined both by by the Solr schema and  and the Blacklight catalog controller script

These dumps are available:

Triple-store captures

The triple-stores used were instances of Virtuoso OpenSource 7 (taken from the develop branch). More specifically, the Virtuoso instances were built from this source:

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languagetext

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.

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These dumps capture the data directories of the three triple-stores:

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