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Metadata reference

Summary

The following document is a reference guide for the internal metadata schema of bibliographic records in InvenioRDM.

Intended audience

This guide is intended for advanced users, administrators and developers of InvenioRDM with significant prior experience.

Overview

InvenioRDM's bibliographic records are stored as JSON documents in a structure that is aligned with DataCite's Metadata Schema v4.x with minor additions and modifications.

Schema version

All records contain a schema definition in the top-level key $schema. The value is a link to the internal JSONSchema which is being used to validate the structure of the record. This field is fully system-managed.

{
    "$schema": "local://records/record-v2.0.0.json",
    ...
}

Top-level fields

Following is an overview of the top-level fields in a record:

Field Description
id/pid The internal persistent identifier for a specific version.
parent The internal persistent identifier for all versions.
pids System-managed external persistent identifiers (DOIs, Handles, OAI-PMH identifiers).
access Access control information.
metadata Descriptive metadata for the resource.
files Associated files information.
tombstone Tombstone information.

Each of these keys will be explained below. Following is an example of how the top-level fields in a record look like:

{
    "$schema": "local://records/record-v1.0.0.json",
    "id": "q5jr8-hny72",
    "pid": { ... },
    "pids" : { ... },
    "parent": { ... },
    "access" : { ... },
    "metadata" : { ... },
    "files" : { ... },
    "tombstone" : { ... },
}

Database-level fields

In addition to the JSON document, the following fields are also stored for each record in the database table:

  • Creation timestamp (UTC).
  • Modification timestamp (UTC).

When querying for a record, they are shown as created and updated in the top level of the record JSON.

System-managed persistent identifiers

A key part of InvenioRDM is the management of persistent identifiers for records. A record always has an internal PID.

Internal PIDs

A record stores information about two internal PIDs:

Specific version PID:

Field Description
id The value of the internal record identifier.
pid Object level information about the identifier needed for operational reasons.

Concept version PID:

Field Description
parent.id The value of the concept record identifier.

Example:

{
  "id": "abcde-12345",
  "pid": {
    "pk": 1,
    "status": "R"
  },
  "parent": {
    "id": "hg5de-2dw08"
  },
}

See Parent for details on the parent field.

External PIDs

External PIDs are persistent identifiers managed via Invenio-PIDStore that may require integration with external registration services.

Persistent identifiers are globally unique in the system, thus you cannot have two records with the same system-managed persistent identifer (see also Metadata > Identifiers).

Only one identifier can be registered per system-defined scheme. Each identifier has the following subfields:

Field Cardinality Description
identifier (1) The identifier value.
provider (1) The provider identifier used internally by the system.
client (0-1) The client identifier used for connecting with an external registration service.
{
  "pids": {
    "doi": {
      "identifier": "10.5281/zenodo.1234",
      "provider": "datacite",
      "client": "zenodo"
    },
    "concept-doi": {
      "identifier": "10.5281/zenodo.1234",
      "provider": "datacite",
      "client": "zenodo"
    }
  }
}

Other system-managed identifiers will also be be recorded here such as the OAI id.

Parent

Information related to the record as a concept is recorded under the top-level parent key. Every record has a parent and that parent connects all versions of a record together. The goal here is to connect these records and store shared information - ownership for now.

Subfields:

Field Cardinality Description
id (1) The identifier of the parent record.
access (1) Access details for the record as a whole.

The access is described with the following subfields:

Field Cardinality Description
owned_by (1-n) An array of owners.

Owners are defined as:

Field Cardinality Description
user (1) The id of the user owning the record as a whole.

Example:

{
  "parent": {
    "id": "fghij-12345",
    "access": {
      "owned_by": [
        {
          "user": 2
        }
      ],
    }
  },
}

Access

The access field denotes record-specific read (visibility) options.

The access field has this structure:

Field Cardinality Description
record (1) "public" or "restricted". Read access to the record.
files (1) "public" or "restricted". Read access to the record's files.
embargo (0-1) Embargo options for the record.

"public" means anyone can see the record/files. "restricted" means only the owner(s) or specific users can see the record/files. Only in the cases of "record": "restricted" or "files": "restricted" can an embargo be provided as input. However, once an embargo is lifted, the embargo section is kept for transparency.

Embargo

The embargo field denotes when an embargo must be lifted, at which point the record is made publicly accessible. The embargo field has this structure:

Field Cardinality Description
active (1) boolean. Is the record under embargo or not.
until (0-1) Required if active true. ISO date string. When to lift the embargo. e.g., "2100-10-01"
reason (0-1) string. Explanation for the embargo.

Example:

{
  "access": {
    "record": "public",
    "files": "public",
    "embargo": {
      "active": false
    }
  },
}

The access field is required by the REST API.

Metadata

The fields are listed below in the combined order of "required" and "appearance on the deposit page". So required fields are listed first and then other fields are listed in the order of their appearance on the deposit page.

The cardinality of each field is expressed in between parenthesis on the title of each field's section. Cardinality here indicates if the field is required by the REST API.

The abbreviation CV stands for Controlled Vocabulary.

Resource type (1)

The type of the resource described by the record. The resource type must be selected from a controlled vocabulary which can be customized by each InvenioRDM instance.

When interfacing with Datacite, this field is converted to a format compatible with 10. Resource Type (i.e. type and subtype). DataCite allows free text for the subtype, however InvenioRDM requires this to come from a customizable controlled vocabulary.

The resource type vocabulary also defines mappings to other vocabularies than Datacite such as Schema.org, Citation Style Language, BibTeX, and OpenAIRE. These mappings are very important for the correct generation of citations due to how different types are being interpreted by reference management systems.

Subfields:

Field Cardinality Description
id (1, CV) The resource type id from the controlled vocabulary.

Example:

{
  "resource_type": {
    "id": "image-photo"
  },
}

Note that only the subtype (which is more specific) is displayed if it exists.

Creators (1-n)

The creators field registers those persons or organisations that should be credited for the resource described by the record. The list of persons or organisations in the creators field is used for generating citations, while the persons or organisations listed in the contributors field are not included in the generated citations.

The field is compatible with 2. Creator in DataCite. In addition we are adding the possiblity of associating a role (like for contributors). This is specifically for cases where e.g. an editor needs to be credited for the work, while authors of individual articles will be listed under contributors.

Subfields:

Field Cardinality Description
person_or_org   (1) The person or organization.
role (0-1, CV) The role of the person or organisation selected from a customizable controlled vocabulary.
affiliations (0-n) Affilations if person_or_org.type is personal.

A person_or_org is described with the following subfields:

Field Cardinality Description
type (1) The type of name. Either personal or organizational.
given_name (1 if type is personal / 0 if type is organizational) Given name(s).
family_name     (1 if type is personal / 0 if type is organizational) Family name.
name (0 if type is personal / 1 if type is organizational) The full name of the organisation. For a person, this field is generated from given_name and family_name
identifiers (0-n) Person or organisation identifiers.

Identifiers are described with the following subfields (note, we only support one identifier per scheme):

Term Cardinality Description
scheme (1, CV) The identifier scheme.
identifier (1) Actual value of the identifier.

Supported creator identifier schemes:

  • ORCID
  • GND
  • ISNI
  • ROR

Supported affiliation identifier schemes:

  • ISNI
  • ROR

Note that the identifiers' schemes are passed lowercased e.g. ORCID is orcid.

The affiliations field consists of objects with the following subfields:

Field Cardinality Description
id (0-1, CV) The organizational or institutional id from the controlled vocabulary.
name (0-1) The name of the organisation or institution.

One of id or name must be given. It's recommended to use name if there is no matching id in the controlled vocabulary.

Example:

{
  "creators": [{
    "person_or_org": {
      "name": "Nielsen, Lars Holm",
      "type": "personal",
      "given_name": "Lars Holm",
      "family_name": "Nielsen",
      "identifiers": [{
        "scheme": "orcid",
        "identifier": "0000-0001-8135-3489"
      }],
    },
    "affiliations": [{
      "id": "01ggx4157",
      "name": "CERN",
    }]
  }],
}

Title (1)

A primary name or primary title by which a resource is known. May be the title of a dataset or the name of a piece of software. The primary title is used for display purposes throughout InvenioRDM.

The fields is compatible with 3. Title in DataCite. Compared to DataCite, the field does not support specifying the language of the title.

Example:

{
  "title": "InvenioRDM",
}

Publication date (1)

The date when the resource was or will be made publicly available.

The field is compatible 5. PublicationYear in DataCite. In case of time intervals, the earliest date is used for DataCite.

Format:

The string must be be formatted according to Extended Date Time Format (EDTF) Level 0. Only "Date" and "Date Interval" are supported. "Date and Time" is not supported. The following are examples of valid values:

  • Date:
    • 2020-11-10 - a complete ISO8601 date.
    • 2020-11 - a date with month precision
    • 2020 - a date with year precision
  • Date Interval:
    • 1939/1945 a date interval with year precision, beginning sometime in 1939 and ending sometime in 1945.
    • 1939-09-01/1945-09 a date interval with day and month precision, beginning September 1st, 1939 and ending sometime in September 1945.

The localization (L10N) of EDTF dates is based on the skeletons defined by the Unicode Common Locale Data Repository (CLDR).

Example:

{
  "publication_date": "2018/2020-09",
}

Additional titles (0-n)

Additional names or titles by which a resource is known.

The field is compatible with 3. Title in DataCite. Compared to DataCite, InvenioRDM splits 3. Title into two separate fields title and additional_titles. This is to ensure consistent usage of a record's title throughout the entire software stack for display purposes.

Subfields:

Field Cardinality Description
title (1) The additional title.
type (1) The type of the title.
lang (0-1, CV) The language of the title.

The type field is as follows:

Field Cardinality Description
id (1, CV) Title type id from the controlled vocabulary. By default one of: alternative-title, subtitle translated-title or other.
title (1) The corresponding localized human readable label. e.g. {"en": "Alternative title"}

Note that multiple localized titles are supported e.g. {"en": "Alternative title", "fr": "Titre alternatif"}. Use ISO 639-1 codes (2 letter locales) as keys. Only id needs to be passed on the REST API.

The lang field is as follows:

Field Cardinality Description
id (1, CV) The ISO-639-3 language code.

Example:

{
  "additional_titles": [{
    "title": "A research data management platform",
    "type": {
      "id": "alternative-title",
      "title": {
        "en": "Alternative Title"
      }
    },
    "lang": {"id": "eng"}
  }]
}

Description (0-1)

The description of a record.

The fields is compatible with 17. Description in DataCite. Compared to DataCite the field does not support specifying the language of the description.

The description may use a whitelist of HTML tags and attributes to style the text.

Example:

{
  "description": "<strong>Test</strong>"
}

Additional descriptions (0-n)

Additional descriptions in addition to the primary description (e.g. abstracts in other languages), methods or further notes.

The field is compatible with 17. Description in DataCite.

Subfields:

Field Cardinality Description
description   (1) Free text.
type (1) The type of the description.
lang (0-1) The language of the description.

The type field is as follows:

Field Cardinality Description
id (1, CV) Description type id from the controlled vocabulary. By default one of: abstract, methods, series-information, table-of-contents, technical-info, other.
title (1) The corresponding localized human readable label. e.g. {"en": "Abstract"}

Note that multiple localized titles are supported e.g. {"en": "Table of contents", "fr": "Table des matières"}. Use ISO 639-1 codes (2 letter locales) as keys. Only id needs to be passed on the REST API.

The lang field is as follows:

Field Cardinality Description
id (1, CV) The ISO-639-3 language code.

Example:

{
  "additional_descriptions": [{
    "description": "The description of a research data management platform.",
    "type": {
      "id": "methods",
      "title": {
        "en": "Methods"
      }
    },
    "lang": {"id": "eng"}
  }]
}

Rights (Licenses) (0-n)

Rights management statement for the resource.

When interfacing with Datacite, this field is converted to be compatible with 16. Rights.

The rights field is intended to primarily be linked to a customizable vocabulary of licenses (defaults SPDX). It should however also be possible to provide custom rights statements.

The rights statements does not have any impact on access control to the resource.

Subfields:

Field Cardinality Description
id (0-1) Identifier value
title (0-1) Localized human readable title e.g., {"en": "The ACME Corporation License."}.
description (0-1) Localized license description text e.g., {"en": "This license..."}.
link (0-1) Link to full license.

REST API:

Either id or title must be passed, but not both.

Example:

{
  "rights": [{
    "id": "cc-by-4.0",
    "title": {"en": "Creative Commons Attribution 4.0 International"},
    "description": {"en": "The Creative Commons Attribution license allows re-distribution and re-use of a licensed work on the condition that the creator is appropriately credited."},
    "link": "https://creativecommons.org/licenses/by/4.0/"
  }],
}

Contributors (0-n)

The organisations or persons responsible for collecting, managing, distributing, or otherwise contributing to the development of the resource.

This field is compatible with 7. Contributor in DataCite.

The structure is identical to the Creators field. The "creators" field records those persons or organisations that should be credited for the resource described by the record (e.g. for citation purposes). The "contributors" field records all other persons or organisations that have contributed, but which should not be credited for citation purposes.

Subfields:

Note that Creators and Contributors may use different controlled vocabularies for the role field.

Example:

{
  "contributors": [{
    "person_or_org": {
      "name": "Nielsen, Lars Holm",
      "type": "personal",
      "given_name": "Lars Holm",
      "family_name": "Nielsen",
      "identifiers": [{
        "scheme": "orcid",
        "identifier": "0000-0001-8135-3489"
      }],
    },
    "role": "editor",
    "affiliations": [{
      "id": "01ggx4157",
      "name": "CERN",
    }]
  }],
}

Subjects (0-n)

Subject, keyword, classification code, or key phrase describing the resource.

This field is compatible with 6. Subject in DataCite.

Subfields:

Field Cardinality Description
id (0-1, CV) The identifier of the subject from the controlled vocabulary.
subject (0-1) A custom keyword.

Either id or subject must be passed.

Example:

{
  "subjects": [{
    "id": "https://id.nlm.nih.gov/mesh/D000001",
  }],
}

Languages (0-n)

The languages of the resource.

This field is compatible with 9. Language in DataCite. DataCite however only supports one primary language, while this field supports multiple languages.

Subfields:

Field Cardinality Description
id (1, CV) The ISO-639-3 language code.

Example:

{
  "languages": [{"id": "dan"}, {"id": "eng"}]
}

Dates (0-n)

Different dates relevant to the resource.

The field is compatible with 8. Date in DataCite.

Subfields:

Field Cardinality Description
date (1) A date or time interval according to Extended Date Time Format Level 0.
type (1) The type of date.
description   (0-1) free text, specific information about the date.

The type field is as follows:

Field Cardinality Description
id (1, CV) Date type id from the controlled vocabulary. By default one of: accepted, available, collected, copyrighted, created, issued, other, submitted, updated, valid, withdrawn.
title (1) The corresponding localized human readable label. e.g. {"en": "Accepted"}

Note that multiple localized titles are supported e.g. {"en": "Available", "fr": "Disponible"}. Use ISO 639-1 codes (2 letter locales) as keys. Only id needs to be passed on the REST API.

Example:

{
  "dates": [{
    "date": "1939/1945",
    "type": {
      "id": "other",
      "title": {
        "en": "Other"
      }
    },
    "description": "A date"
  }],
}

Version (0-1)

The version number of the resource. Suggested practice is to use semantic versioning. If the version number is provided, it's used for display purposes on search results and landing pages.

This field is compatible with 15. Version in DataCite.

Example:

{
  "version": "v1.0.0",
}

Publisher (0-1)

The name of the entity that holds, archives, publishes, prints, distributes, releases, issues, or produces the resource. This property will be used to formulate the citation, so consider the prominence of the role. For software, use Publisher for the code repository. If there is an entity other than a code repository, that "holds, archives, publishes, prints, distributes, releases, issues, or produces" the code, use the property Contributor field for the code repository.

Defaults to the name of the repository.

Example:

{
  "publisher": "InvenioRDM"
}

Alternate identifiers (0-n)

Persistent identifiers for the resource other than the ones registered as system-managed internal or external persistent identifers.

This field is compatible with 11. Alternate Identifiers in DataCite.

The main difference between the system-managed identifiers and this field, is that system-managed identifiers are fully controlled and managed by InvenioRDM, while identifiers listed here are used solely for display purposes. For instance, a DOI registered in the system-managed identifiers will prevent another record with the same DOI from being created. A DOI included in this field, will not prevent another record from including the same DOI in this field.

Subfields:

Field Cardinality Description
identifier (1) identifier value
scheme (1, CV) The scheme of the identifier

Supported identifier schemes:

ARK, arXiv, Bibcode, DOI, EAN13, EISSN, Handle, IGSN, ISBN, ISSN, ISTC, LISSN, LSID, PubMed ID, PURL, UPC, URL, URN, W3ID. See RDM_RECORDS_IDENTIFIERS_SCHEMES in invenio-rdm-records.

Note that those are passed lowercased e.g., arXiv is arxiv.

Example:

{
  "identifiers": [{
    "identifier": "1924MNRAS..84..308E",
    "scheme": "bibcode"
  }],
}

Identifiers of related resources.

This field is compatible with 12. Related Identifiers in DataCite. The field however does not support the subfields 12.c relatedMetadataScheme, 12.d schemeURI and 12.e schemeType used for linking to additional metadata.

Subfields:

Field Cardinality Description
identifier (1, CV) A global unique persistent identifier for a related resource.
scheme (1, CV) The scheme of the identifier.
relation_type     (1) The relation of the record to this related resource.
resource_type    (0-1) The resource type of the related resource. Can be different from the Resource type field.

Supported identifier schemes:

  • ISBN10, ISBN13, ISSN, ISTC, DOI, Handle, EAN8, EAN13, ISNI ORCID, ARK, PURL, LSID, URN, Bibcode, arXiv, PubMed ID, PubMed Central ID, GND, SRA, BioProject, BioSample, Ensembl, UniProt, RefSeq, Genome Assembly.

The field relation_type is of this shape:

Field Cardinality Description
id (1, CV) Relation type id from the controlled vocabulary. The default list is here.
title (1) The corresponding localized human readable label. e.g. {"en": "Is cited by"}

The field resource_type is of this shape:

Field Cardinality Description
id (1, CV) Date type id from the controlled vocabulary. The default list is here.
title (1) The corresponding localized human readable label. e.g. {"en": "Annotation collection"}

For both relation_type.title and resource_type.title multiple localized titles are supported e.g. {"en": "Cites", "fr": "Cite"}. Use ISO 639-1 codes (2 letter locales) as keys. In both cases, only id needs to be passed on the REST API.

Example:

{
  "related_identifiers": [{
    "identifier": "10.1234/foo.bar",
    "scheme": "doi",
    "relation_type": {
      "id": "cites",
      "title": {
        "en": "Cites"
      }
    },
    "resource_type": {
      "id": "dataset",
      "title": {
        "en": "Dataset"
      }
    }
  }],
}

Sizes (0-n)

Not part of the deposit page yet.

Although available via the API, this field may see changes when added to the deposit page.

Size (e.g. bytes, pages, inches, etc.) or duration (extent), e.g. hours, minutes, days, etc., of a resource.

This field is compatible with 13. Size in DataCite.

Example:

{
  "sizes": [
    "11 pages"
  ],
}

Formats (0-n)

Not part of the deposit page yet.

Although available via the API, this field may see changes when added to the deposit page.

Technical format of the resource.

This field is compatible with 14. Format in Datacite.

Example:

{
  "formats": [
    "application/pdf"
  ],
}

Locations (0-n)

Not part of the deposit page yet.

Although available via the API, this field may see changes when added to the deposit page.

Spatial region or named place where the data was gathered or about which the data is focused.

The field is compatible with 18. GeoLocation in DataCite Metadata Schema. The field however has important differences:

  • The field allows associating geographical identifiers with a location.
  • The field allows associating a free text description to the location.
  • The field uses the GeoJSON specification for describing geospatial coordinates instead of the individual fields used by DataCite.

The location fields is modelled over GeoJSON FeatureCollection and Feature objects using foreign members (for identifiers, place and description). We do not store the GeoJSON type information (e.g. "type": "FeatureCollection" and "type": "Feature") because this information is implicit. The JSON served on the REST API (external JSON), will include the type information as well as "properties": null in order to make it valid GeoJSON.

Subfields:

Field Cardinality Description
features (1) A list of GeoJSON feature objects. The reason for this keyword is to align with GeoJSON and allow for later expansion with other subfields such as bounding box (bbox) from the GeoJSON spec.

Subfields of items in features:

Field Cardinality Description
geometry (0-1) A GeoJSON Geometry Object according to RFC 7946. Note, GeoJSON's coordinate reference system is WGS84.
identifiers    (0-1) Identifiers for the geographic locations. This could for instance be from GeoNames or Getty Thesaurus of Geographic Names (TGN) which would allow linking to historic places.
place (0-1) Free text, used to describe a geographical location.
description (0-1) Free text, used for any extra information related to the location.

Notes:

  • Indexing: The geometry field is indexed as a geo_shape field type in Elasticsearch which allows advanced geospatial querying. In addition, for each geometry object, we calculate the centroid using the Shapely library and index it as a geo_point field type in Elasticsearch which supports more specialised queries for points.
  • Initially only Point objects will be supported in the upload form and landing page. This is primarily due to need for a user-friendly field.

Example:

{
  "locations": {
    "features": [{
      "geometry": {
        "type": "Point",
        "coordinates": [6.05, 46.23333]
      },
      "identifiers": {
        "geonames": "2661235",
        "tgn": "http://vocab.getty.edu/tgn/8703679"
      },
      "place": "CERN",
      "description": "Invenio birth place."
    }],
  },
}

Funding references (0-n)

Not part of the deposit page yet.

Although available via the API, this field may see changes when added to the deposit page.

Information about financial support (funding) for the resource being registered.

This field is compatible with 19. Funding Reference in DataCite.

The funder subfield is intended to be linked to a customizable vocabulary from Open Funder Registry or ROR. The award subfields is intended to be either linked to a customizable vocabulary sourced from the OpenAIRE grant database, or be specified explicitly to allow linking to grants not provided by the grant database.

Subfields:

Field Cardinality Description
funder (0-1) The organisation of the funding provider.
award (0-1) The award (grant) sponsored by the funder.

At least one of funder or award must be provided.

The funder subfields:

Field Cardinality Description
name (1) The name of the funder.
scheme (0-1, CV) The scheme of the identifier.
identifer (0-1) A unique identifier for the funder.

Supported schemes:

  • CrossRef Funder ID
  • GRID
  • ISNI
  • ROR
  • Wikidata

Note that those are passed lowercased e.g., GRID is grid.

The award subfields:

Field Cardinality Description
title (1) The title of the award
number (1) The code assigned by the funder to a sponsored award (grant).
scheme (0-1) The scheme of the identifier.
identifer (0-1) A unique identifier for the funder.

Example:

{
  "funding": [{
      "funder": {
        "name": "European Commission",
        "identifier": "00k4n6c32",
        "scheme": "ror"
      },
      "award": {
        "title": "OpenAIRE",
        "number": "246686",
        "identifier": ".../246686",
        "scheme": "openaire"
      }
  }]
}

References (0-n)

Not part of the deposit page yet.

Although available via the API, this field may see changes when added to the deposit page.

A list of reference strings

Subfields:

Field Cardinality Description
reference (1) free text, the full reference string
scheme (0-1) the scheme of the identifier.
identifier (0-1) the identifer if known.

Supported schemes:

  • CrossRef Funder ID
  • GRID
  • ISNI
  • Other

Note that those are passed lowercased with spaces removed e.g., CrossRef Funder ID is crossreffunderid.

Example:

{
  "references": [{
      "reference": "Nielsen et al,..",
      "identifier": "10.1234/foo.bar",
      "scheme": "doi"
  }]
}

Files

Records may have associated digital files. A record is not meant to be associated with a high number of files, as the files are stored inside the record and thus increase the overall size of the JSON document.

All of the fields below are under the "files" key.

Enabled (1)

The enabled field determines if the record is a metadata-only record or if files are associated.

Example:

{
  "enabled": false
}

In this case, the record has (and can have) no associated files. It is a metadata-only record.

Entries (0-n)

The entries field lists the associated digital files for the resource described by the record. The files must all be registered in Invenio-Files-REST store independently. This is to ensure that files can be tracked and fixity can be checked.

The key (paper.pdf below) represents a file path.

Subfields:

Field Cardinality Description
bucket_id (1) The bucket identifier.
version_id (1) The logical object identifier.
file_id (1) The digital file instance identifier (references a file on storage).
backend (1) The backend for the file.
key (1) The filepath of the file.
mimetype (1) The mimetype of the file.
size (1) The size in bytes of the file.
checksum (1) The checksum of the file in the form <algorithm>:<value>.

Example:

{
  "entries": {
    "paper.pdf": {
      "version_id": "<object-version-id>",
      "bucket_id": "<bucket-id>",
      "file_id": "<file-id>",
      "backend": "...",
      "storage_class": "A",
      "key": "paper.pdf",
      "mimetype": "application/pdf",
      "size": 12345,
      "checksum": "md5:abcdef...",
    },
  }
}

Default preview (0-1)

The default preview field names the filename of the file which should by default be shown on the record landing page.

Example:

{
  "default_preview": "paper.pdf"
}

Tombstone

A tombstone is created when a record is removed from the system. The tombstone records the reason for the removal, a category for statistics purposes, who removed the record and when.

Subfields:

Field Cardinality Description
reason (1) Free text, the reason for removal.
category (1) An identifier for a category of reasons. Used for statistics purposes and for extracting e.g. spam records from the system.
removed_by (1) The user who removed the record.
timestamp (1) The UTC timestamp when the record was removed.

Example:

{
  "tombstone": {
    "reason": "Spam record, removed by InvenioRDM staff.",
    "category": "spam_manual",
    "removed_by": {"user": 1},
    "timestamp": "2020-09-01T12:02:00Z"
  }
}

Future directions

The record metadata model will evolve over time, during which some of the following information will be added:

  • Usage statistics
  • Communities
  • Extra metadata formats
  • Primary contact (contact email)
  • Vocabulary extensions