Introducing Component Metadata
Metadata for language resources and tools exists in a multitude of formats. Often these descriptions contain specialised information for a specific research community (e.g. headers for text, for multimedia collections).
To overcome this dispersion CLARIN has initiated the Component MetaData Infrastructure ( ). It provides a framework to describe and reuse metadata blueprints. Description building blocks ('components', which include field definitions) can be grouped into a ready-made description format (a 'profile'). Both are stored and shared with other users in the Component Registry to promote reuse. Each metadata record is then expressed as an XML file, including a link to the profile on which it is based.
The CMDI approach combines architectural freedom when modeling the metadata with powerful exploration and search possibilities over a broad range of language resources.
To date, there are two supported versions of CLARIN's component metadata framework: CMDI 1.1 and CMDI 1.2. They are not interchangeable, but CMDI 1.1 metadata can easily be converted into CMDI 1.2. More information about the changes in CMDI 1.2, its place in the infrastructure and how it may affect you as a user, metadata creator, modeller, repository owner or software developer can be found on the CMDI 1.2 page. The general information in this page applies to both CMDI 1.1 and CMDI 1.2.
Further Information and Examples
For a detailed explanation, take a look at the Frequently Asked Questions (FAQs) about CMDI
- The chapter "Component Metadata Infrastructure" from the book CLARIN (2022), which presents an overview of the CMD infrastructure and its development over time (doi.org/10.1515/9783110767377-008)
CMDI best practice guide (draft):
Creating CMDI components and profiles
- Component Registry (Select your organization from the list, or if that does not work, select "clarin.eu website account" and use your email/password from the CLARIN site to login - email should be in lower case!)
- Documentation for users
- Documentation in German from the NaLiDa project: http://www.sfs.uni-tuebingen.de/nalida/doku/tutorials/component-registry.html
- Documentation for developers (REST webservice)
using the CLARIN Concept Registry to create Concept Links in CMDI:
Coala converts spreadsheet tables containing speech corpus metadata into standardized CMDI files.
Browsing, searching and using CMDI metadata
- Virtual Language Observatory:
- Early-stage prototypes (limited functionality!):
- Using Islandora (Fedora + Drupal) with CMDI
- Using Fedora with CMDI (in German)
- Repository setup with Fedora and CMDI at IDS
- CMDI (and other metadata) in DSpace repositories (Lindat/CLARIN) (also see these technical notes)
Quality and validation
- The CLARIN Curation Dashboard carries out on-demand and automated quality checks for CMDI metadata profiles, records and collections. It also verifies the availability of resources referenced from harvested metadata.
- The OAI-PMH harvest viewer provides details and statistics on the latest metadata harvest
- please mail your questions and suggestions to firstname.lastname@example.org
- alternatively, contact your national CLARIN helpdesk
- CLARIN-NL workshop, 2014-03-04, Utrecht
- CLARIN-NL workshop, with extended video material and excercises, 2012-09-13, Nijmegen
Additional informative material:
Are you interested in organizing or following a CMDI training course? Please contact us!