A short overview of CMD2RDF for the CLARIAH LOD IG

1. CMD2RDF
Menzo.Windhouwer@di.huc.knaw.nl

2. Aim
• Not: the way to make LOD datasets findable
• But (inspirational):
• showcase how to make old fashioned (XML)
metadata queriable in LOD
• How one could integrate some well established
(repository) tech in a LOD context
• However:
• CMDI could have (a) profile(s) specially for LOD
datasets, which would make them findable in
CLARIN’s VLO

3. Component Metadata
CCR
Metadata Profile
Technical
Metadata
Sample frequency
Format
Size
Let’s describe an
audio recording
Language Name
Id (aaa … zzj)
Actor
Sex (male, female)
Language
Age
Name
Location
Continent
Country
Address
Project Name
Contact
CLAVAS

4. Component Metadata Infrastructure
OAI-PMH
provider
OAI-PMH
harvester
Local
metadata
repository
Joint
metadata
repository
metadata
modeler
metadata
user
metadata
creator
component
registry &
editor
metadata
editor
metadata
curator
metadata
curator
metadata
catalogue
Relation
Registrysearch &
semantic
mapping
DATA
Concept
Registry
Vocabulary
Service

5. CMD2RDF
OAI
harvester
CLARIN
joint
metadata
domain
CMD2RDF
• conversion
• enrichment
Virtuoso
caching
CMD-RDF
• SPARQL
• REST
• browse
(L)L(O)D cloud
Component
Registry
CLAVAS
WALS
Technology:
• Virtuoso RDF store
• Elda as browser
• Tomcat as application server
• Conversion pipeline in Java
• Core transforms in XSLT
• All source code on GitHub,
• Docker build file & images available

6. 2RDF
• CMD is classicW3C schema constrained XML
• To map a CMD record to RDF we need
• A mapping for the basic component model to RDFS
• Basic classes and properties to represent profiles, components,
elements, attributes and their relationships and values
• A mapping for a specific profile or component to RDFS
• A specific subclass or subproperty of the basic component model
• A mapping for specific metadata records to RDF instances of RDFS
• Instances of profile or component
• Additionaly there is a generic CMD envelop that is mapped using
common LOD vocabularies

7. Demo
• Velar nasal
• https://www.youtube.com/watch?v=-RfiBn9qPlM
• https://wals.info/feature/9A#2/20.0/151.7
• http://cmdi2rdf.meertens.knaw.nl/cmd2rdf/how
SELECT DISTINCT ?resource ?mimetype ?language ?value
WHERE {
?feature dcterms:references wals:9A .
?feature dcterms:hasPart/rdfs:label ?value .
?feature ^dcterms:isReferencedBy/owl:sameAs ?language.
GRAPH ?g {
?cmd vlo:hasFacetISO6393ElementEntity ?language .
?cmd oa:hasTarget ?resource .
?resource cmdm:hasMimeType ?mimetype .
}.
}
• Crosses once from data to metadata

8. Holy grail
• Data: interesting typological feature
• Metadata: find lexica for the languages
• Data: find a word wich exposes the feature, find
its phonetic transciption
• Metadata: find multimodal annoations for the
language
• Data: match the word in the phonetic tier
• Metadata: find annotated media resource
• Data: show the mediafragment containing the
utterance