This document provides an overview of the Component Metadata Infrastructure service. It discusses the motivation and architecture of the service, including core components, interfaces, access policies, usage options, use cases, and documentation. The service aims to improve discovery of research data sets by providing standardized metadata descriptions that can enable automated processing.

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CLARIN
Component Metadata Infrastructure

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Motivation and driving consideration about the service
Service architecture and interfaces: overview
- How the user can access the service
- Service options and attributes
Acceptable Usage Policy (AUP)
Access policy
Use cases
Documentation/tutorial/information
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Content

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Goal: stimulate the discoverability of data sets, making the
citation of these more convenient and to take away the
barriers to automated processing of data
Metadata for digital objects exists in a multitude of formats.
Often the schemas for these descriptions focus on
specialized information for a specific research community.
Component Metadata (CMD) provides a framework to
describe and reuse (parts of) existing metadata blueprints,
with support for expressing semantics in a standardized way
at both blueprint and description layers.
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Motivation

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Core infrastructure components
- Core schemas and transformations (CMD toolkit)
- Semantic registry (CLARIN concept registry)
- Component and schema registry and editor (Component
Registry)
Exploitation stack:
- Faceted browser (VLO – service launched September 2018)
- Tool discovery (Switchboard – service to be launched)
- Resource collection registry and editor (VCR – service to be
launched)
Connections and dependencies
- EUDAT: service integration (B2SHARE, B2DROP)
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Service architecture and interfaces

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Core components
- CMD toolkit: XML tooling (XSD, XSLT), binaries, scripting
- Concept registry: GUI and REST API (open for retrieval)
- Component Registry: GUI and REST API (open for retrieval)
Exploitation stack:
- Faceted browser (VLO): web GUI; data can be provided
using the OAI-PMH protocol
- Switchboard: GUI (not yet launched)
- VCR: GUI and REST API (not yet launched)
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Service access

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CLARIN has a fair use policy for research purposes
CLARIN at present does not have a published acceptable
usage policy description
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Acceptable Usage Policy

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Access policies:
- Open access to all read-only services
- All metadata is open
- Certain parts that require writing rights require a login,
which is policy-based
 anyone with academic credentials (single sign-on) can access
 interested citizen scientists can register an account in the
CLARIN Identity Provider
- Described resources may require authorization, depending
on the policy of the resource provider (out of scope of the
metadata infrastructure)
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Access policies

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The component metadata model is very flexible and
virtually any metadata description scheme new or
existing can be modelled. Core tooling supports this
flexibility.
Interoperability options can be implemented on top of
the core services stack
Metadata sourcing options: OAI-PMH harvesting or
static metadata provisioning
Exploitation can be customised in terms of fields and
search/display facets (VLO), connected tools
(Switchboard)
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Service options and attributes

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Primary user community: Social Sciences and Humanities
scholars – but in principle also applies to other domains
Resources and metadata can be submitted to the user’s
‘native’ repository or at any repository willing to ingest.
CLARIN harvests metadata from repositories connected to
the infrastructure and processes it for:
- Uniform presentation
- Search and discovery on basis of common metadata concepts
- Further exploitation within the infrastructure at small or large
scale (processing with connected tools, virtual collections)
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Featured use case

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All Component Metadata documentation is available via
https://www.clarin.eu/cmdi
Component modelling documentation
- https://www.clarin.eu/content/component-registry-
documentation
Exploitation stack documentation
- https://vlo.clarin.eu/help
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Documentations

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