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Table 1 Description for each maturity indicator of how the ERM is FAIR and how it can be used to make nanosafety data FAIR

From: European Registry of Materials: global, unique identifiers for (undisclosed) nanomaterials

  FAIR Maturity Indicators FAIRness of the ERM identifier and registry How the ERM can make data FAIR
Findability F1. (Meta)data are assigned a globally unique and persistent identifier The registry is released to Zenodo, which provides it with a DOI The ERM identifier is a globally unique and persistent identifier; The registry supports depositing metadata
F2. Data are described with rich metadata (defined by R1 below) The ERM identifier is registered with FAIRSharing at fairsharing.org/bsg-s001384/, in identifiers.org at registry.identifiers.org/registry/erm (MIR:00,000,763), and in Bioregistry at bioregistry.io/registry/erm The ERM is one important aspect of rich metadata and helps make metadata findable across resources
F3. Metadata clearly and explicitly include the identifier of the data they describe The registry archive uses the DOI to point to that version of the registry content The ERM identifier can easily be included in spreadsheets and as Compact Identifiers in reports
F4. (Meta)data are registered or indexed in a searchable resource Zenodo records and DOIs are indexed by many services Some metadata can be shared in the registry, but with the ERM identifier further metadata can also be provided via other channels
Accessibility A1. (Meta)data are retrievable by their identifier using a standardised communications protocol GitHub and Zenodo use HTTP  
A2. Metadata are accessible, even when the data are no longer available Zenodo guarantees availability for 20 years  
Interoperability I1. (Meta)data use a formal, accessible, shared, and broadly applicable language for knowledge representation The registry uses the RDF specification and all instances are annotated with ontologies ERM identifiers are URIs and can be expressed as Compact Identifiers
I2. (Meta)data use vocabularies that follow FAIR principles The ERM is FAIR and by using it, users implement I2
I3. (Meta)data include qualified references to other (meta)data The registry explicitly encourages users to link to other resources, including webpages and projects The global unique ERM identifier enables linking (meta)data
Reusability R1. Meta(data) are richly described with a plurality of accurate and relevant attributes The registry is available under a CCZero license. The ERM identifiers specification is documented on GitHub and archived on Zenodo By adding the global unique ERM identifier to research output, reuse is facilitated. The ERM identifiers simplify tracking the provenance of nanomaterials and their properties