This document discusses using the Catmandu tool to process linked data. It describes how Catmandu can be used to convert between different data formats like MARC, JSON, RDF, and load/export to systems. The document outlines a typical workflow of: 1) Exporting from a catalog to MARC, 2) Converting MARC to JSON, 3) Converting JSON to RDF, and 4) Enriching the RDF with links to external datasets. It provides examples of Catmandu commands for conversion, fixing fields, and importing/exporting to different systems.

1. Processing Linked Data
with
Catmandu
Patrick Hochstenbach | UGent
http://librecat.org

2. Processing Linked Data with Catmandu | http://librecat.org
LUND
GHENT
BIELEFELD

3. Processing Linked Data with Catmandu | http://librecat.org
RATIONALE

4. Processing Linked Data with Catmandu | http://librecat.org
KAHN-WILENSKI WEB
HANDLE
SERVICE
PROVIDER
REPOSITORY
REPOSITORY
I search a paper
about...

5. Processing Linked Data with Catmandu | http://librecat.org
Hypothesis 1: one network with a common schema
Hypothesis 2: object-oriented design
Hypothesis 3: the resource is the message

6. Processing Linked Data with Catmandu | http://librecat.org
Hypothesis 1: one network with a common schema
GOOGLE EUROPEANA
OPENAIRE CRIS
Videos
Images
Books
Data sets

7. Processing Linked Data with Catmandu | http://librecat.org
Hypothesis 2: object-oriented design
Drive
Race
Park
Economy Compact
Minivan
Convertible
Wheel
Half car
Bicycle
Zeppelin

8. Processing Linked Data with Catmandu | http://librecat.org
Hypothesis 3: the resource researcher is the message
DNS
GOOGLE
REPOSITORY
CLOUD
Dr. Müller

9. Processing Linked Data with Catmandu | http://librecat.org
LIBRECAT/CATMANDU

10. Processing Linked Data with Catmandu | http://librecat.org
CATMANDU
PubMed
MARC
MODS
EXCEL
DSPACE
Fedora
SRU
OAI-PMH
DBI
ISI Twitter
DBI
Atom
EXCEL
RDF
JSON
XML
Solr
ElasticSearch
MongoDB
Fedora
Aleph
Fix

11. Processing Linked Data with Catmandu | http://librecat.org
FUNCTIONAL DESIGN
JSON
}
each
slice
take
group
select
map
reduce
add_field
join_field
lookup
remove_field
marc_mab
count

12. Processing Linked Data with Catmandu | http://librecat.org
LIBRECAT
Institutional Repositories
Search Engines
Image Databases
Archival Systems
Data cleaning workbench
Citation Style Processor

13. Processing Linked Data with Catmandu | http://librecat.org
CATMANDU
catmandu convert MARC to JSON < records.mrc
catmandu convert OAI --url http://server/OAI to JSON
catmandu convert SRU --url http://server/SRU --query dna to JSON
catmandu convert DBI --query ‘SELECT * FROM table’ to JSON
catmandu convert MARC to JSON < records.mrc
catmandu convert OAI --url http://server/OAI to XML
catmandu convert SRU --url http://server/SRU --query dna to YAML
catmandu convert ArXiv --query ‘all:electron’ to CSV
CONVERT

14. Processing Linked Data with Catmandu | http://librecat.org
CATMANDU
catmandu convert X to Y --fix ‘marc_map(“245”,”title”)’
catmandu convert X to Y --fix ‘prepend(“title”,”abcd-”)’
catmandu convert X toY --fix fixes.txt
fixes.txt:
remove_field(“_id”);
marc_map(“001”, “merge.id”);
prepend(“merge.id”, “author:”);
add_field(“merge.source”,”author”);
copy_field(“merge.id”,”_id”);
FIX
set_field add_field move_field copy_field remove_field
upcase downcase capitalize trim substring prepend append
lookup lookup_in_store
count
cmd
split_field join_field retain_field replace_all collapse expand clone
if_all_match if_any_match if_exists

15. Processing Linked Data with Catmandu | http://librecat.org
CATMANDU
catmandu import JSON to MongoDB --opt ... --opt ...
catmandu import MARC to ElasticSearch
catmandu import DC to FedoraCommons
catmandu import CSV to DBI
catmandu export MongoDB to JSON
catmandu export Solr to YAML
catmandu export DBI to CSV
catmandu export FedoraCommons to Template --template test.tt
test.tt: (TemplateToolKit)
[%- FOREACH f IN record %]
[% _id %] [% f.shift %][% f.shift %][% f.shift %][% f.join(“:”) %]
[%- END %]
IMPORT / EXPORT

16. Processing Linked Data with Catmandu | http://librecat.org
CATMANDU
https://metacpan.org/pod/Catmandu
https://github.com/LibreCat/Catmandu
http://librecat.org/tutorial/
http://librecat.org/catmandu/2013/06/21/catmandu-cheat-sheet.html

17. Processing Linked Data with Catmandu | http://librecat.org
LIBRECAT http://biblio.ugent.be

18. Processing Linked Data with Catmandu | http://librecat.org
LIBRECAT http://pub.uni-bielefeld.de/en

19. Processing Linked Data with Catmandu | http://librecat.org
LIBRECAT http://adore.ugent.be

20. Processing Linked Data with Catmandu | http://librecat.org
LIBRECAT http://libnew.ugent.be

21. Processing Linked Data with Catmandu | http://librecat.org
Architecture
FEDORA
MEDIAMOSA
VLE BIBLIO SCANNING
RECEIVE
ALEPH ABS
CLOUD
DEDUP/MERGE/AUGMENT
BLACKLIGHT

22. Processing Linked Data with Catmandu | http://librecat.org
LINKED DATA

23. Processing Linked Data with Catmandu | http://librecat.org
PRODUCTION
CATALOG
MARC
245 $$a ... $$b
260 $$a ...
700 $$a ...
JSON/YAML
LINKED DATA

24. Processing Linked Data with Catmandu | http://librecat.org
STAGE 1: CATALOG to MARC
CATALOG
MARC
245 $$a ... $$b
260 $$a ...
700 $$a ...
$ catmandu export ALEPH to MARC

25. Processing Linked Data with Catmandu | http://librecat.org
STAGE 2: MARC to JSON
MARC
245 $$a ... $$b
260 $$a ...
700 $$a ...
JSON/YAML

26. Processing Linked Data with Catmandu | http://librecat.org
MARC
245 $$a ... $$b
260 $$a ...
700 $$a ...
JSON/YAML
STAGE 2: MARC to JSON
Tolstoj, Lev Nikolaevič,
Author
War and peace /
Title
1952.
Publication Year
Napoleonic Wars,
Subject

27. Processing Linked Data with Catmandu | http://librecat.org
STAGE 2: MARC to JSON
MARC
245 $$a ... $$b
260 $$a ...
700 $$a ...
JSON/YAML
Tolstoj, Lev Nikolaevič,
War and peace /
1952.
Napoleonic Wars,
Author
Title
Year
Subject
Tolstoj, Lev Nikolaevič
War and peace
1952
Napoleonic Wars
Author
Title
Year
Subject
FIX

28. Processing Linked Data with Catmandu | http://librecat.org
STAGE 3a: JSON to RDF
JSON/YAML
LINKED DATA
Tolstoj, Lev Nikolaevič
War and peace
1952
Napoleonic Wars
Author
Title
Year
Subject
?
Tolstoj, Lev Nikolaevič
War and peace
1952
Napoleonic Wars
dc:creator
dc:title
dc:date
dc:subject
FIX

29. Processing Linked Data with Catmandu | http://librecat.org
JSON/YAML
LINKED DATA
STAGE 3a: JSON to RDF
<http://example.org/000000008>
<http://purl.org/dc/elements/1.1/creator> “Tolstoj, Lev Nikolaevič”;
<http://purl.org/dc/elements/1.1/title> “War and peace” ;
<http://purl.org/dc/elements/1.1/date> “1952” ;
<http://purl.org/dc/elements/1.1/subject> “Napoleonic Wars” ;
a <http://www.europeana.eu/schemas/edm/Book> .
FIX
RDF/Turtle
http://demo.librecat.org/

30. Processing Linked Data with Catmandu | http://librecat.org
STAGE 3b: RDF to Linked Data
JSON/YAML
LINKED DATA
<http://example.org/000000008>
<http://purl.org/dc/elements/1.1/creator> “Tolstoj, Lev Nikolaevič”;
<http://purl.org/dc/elements/1.1/title> “War and peace” ;
<http://purl.org/dc/elements/1.1/date> “1952” ;
<http://purl.org/dc/elements/1.1/subject> “Napoleonic Wars” ;
a <http://www.europeana.eu/schemas/edm/Book> .
<http://example.org/000000008>
<http://purl.org/dc/elements/1.1/creator> <http://viaf.org/viaf/96987389>;
<http://purl.org/dc/elements/1.1/title> “War and peace” ;
<http://purl.org/dc/elements/1.1/date> “1952” ;
<http://purl.org/dc/elements/1.1/subject> <http://dbpedia.org/page/Napoleonic_
Wars> ;
a <http://www.europeana.eu/schemas/edm/Book> .
FIX

31. Processing Linked Data with Catmandu | http://librecat.org
THANK YOU
Nicolas Steenlant
Nicolas Franck Snorri Briem
Jörgen Eriksson
Maria Hedberg
Dave Sheroman
Friedrich Summann
Najko Jahn
Vitali Peil
Petra Kohorst
Christian Pietsch
Mathias Lösch
Johan RolschewskiJakob Voß
UGENT
LUND
BIELEFELD
GBV STAATSBIBLIOTHEK ZU BERLIN
Wouter Willaert
INUITS