Virtual Sets¶

Overview of all virtual sets generated from the EHRI GraphQL API.

Data Characteristics¶

Update Cycle: Daily at 03:00 UTC
Stability: Very high - virtual sets change rarely
Deletions: Not tracked
Format: Dublin Core (oai_dc) only

Available Sets¶

ehri:camps - EHRI Camps¶

Description: Authority list of concentration and extermination camps, based on the USHMM Encyclopedia of Camps and Ghettos.

Property	Value
Set Spec	`ehri:camps`
Number of Entries	3,074
GraphQL Source	`CvocVocabulary(id: "ehri_camps")`
Portal URL	`https://portal.ehri-project.eu/keywords/{id}`

ehri:ghettos - EHRI Ghettos¶

Description: Authority list of ghettos in Nazi-occupied Europe, based on Yad Vashem and USHMM sources.

Property	Value
Set Spec	`ehri:ghettos`
Number of Entries	1,367
GraphQL Source	`CvocVocabulary(id: "ehri_ghettos")`
Portal URL	`https://portal.ehri-project.eu/keywords/{id}`

ehri:terms - EHRI Terms¶

Description: Hierarchical, multilingual subject heading system for Holocaust research.

Property	Value
Set Spec	`ehri:terms`
Number of Entries	913
GraphQL Source	`CvocVocabulary(id: "ehri_terms")`
Portal URL	`https://portal.ehri-project.eu/keywords/{id}`

ehri:persons - EHRI Personalities¶

Description: Persons from EHRI cataloging activities and partner institutions.

Property	Value
Set Spec	`ehri:persons`
Number of Entries	3,375
GraphQL Source	`AuthoritativeSet(id: "ehri_pers")`
Portal URL	`https://portal.ehri-project.eu/authorities/{id}`

ehri:corporatebodies - EHRI Corporate Bodies¶

Description: Corporate bodies and organizations relevant to Holocaust research.

Property	Value
Set Spec	`ehri:corporatebodies`
Number of Entries	5,140
GraphQL Source	`AuthoritativeSet(id: "ehri_cb")`
Portal URL	`https://portal.ehri-project.eu/authorities/{id}`

ehri:countries - EHRI Countries¶

Description: National reports on Holocaust history and archival landscape.

Property	Value
Set Spec	`ehri:countries`
Number of Entries	66
GraphQL Source	`countries`
Portal URL	`https://portal.ehri-project.eu/countries/{id}`

ehri:repositories - EHRI Repositories¶

Description: Archival institutions worldwide with Holocaust-related material.

Property	Value
Set Spec	`ehri:repositories`
Number of Entries	2,317
GraphQL Source	`repositories`
Portal URL	`https://portal.ehri-project.eu/institutions/{id}`

GraphQL to Dublin Core Transformations¶

Overview¶

Virtual sets are retrieved from the EHRI GraphQL API and transformed into standard Dublin Core (DC) metadata. This page documents the detailed mappings for each data type.

Common DC Elements for All Types¶

Every virtual record contains the following base elements:

DC Element	Source	Description
`dc:identifier`	`id`	Primary identifier in format `ehri_{type}-{id}`
`dc:identifier`	Constructed URL	EHRI portal URL with `url:` prefix (see below)
`dc:type`	`type`	GraphQL type (e.g. CvocConcept, HistoricalAgent)
`dc:type`	Fixed value	"Text" for all records
`dc:rights`	Fixed value	"European Holocaust Research Infrastructure"

Semantic Prefixes in Dublin Core Elements:

Virtual set records use semantic prefixes to clarify the meaning of values:

Prefix	Used in	Example
`url:`	`dc:identifier`	`url:https://portal.ehri-project.eu/keywords/ehri_camps-1`
`geo:`	`dc:coverage`	`geo:50.026199,19.204099`
`temporal:`	`dc:coverage`	`temporal:1889-1945`
`spatial:`	`dc:coverage`	`spatial:Budapest, Hungary`

How Portal URLs are Generated¶

EHRI portal URLs are constructed based on set type and ID:

Set Type	URL Format	Example
`ehri:camps`	`https://portal.ehri-project.eu/keywords/{id}`	https://portal.ehri-project.eu/keywords/ehri_camps-1
`ehri:ghettos`	`https://portal.ehri-project.eu/keywords/{id}`	https://portal.ehri-project.eu/keywords/ehri_ghettos-449
`ehri:terms`	`https://portal.ehri-project.eu/keywords/{id}`	https://portal.ehri-project.eu/keywords/ehri_terms-100
`ehri:persons`	`https://portal.ehri-project.eu/authorities/{id}`	https://portal.ehri-project.eu/authorities/ehri_pers-000001
`ehri:corporatebodies`	`https://portal.ehri-project.eu/authorities/{id}`	https://portal.ehri-project.eu/authorities/ehri_cb-001234
`ehri:countries`	`https://portal.ehri-project.eu/countries/{id}`	https://portal.ehri-project.eu/countries/de
`ehri:repositories`	`https://portal.ehri-project.eu/institutions/{id}`	https://portal.ehri-project.eu/institutions/de-002624

Camps (ehri:camps)¶

GraphQL Query¶

query GetCamps {
  CvocVocabulary(id: "ehri_camps") {
    concepts {
      items {
        id
        type
        seeAlso
        latitude
        longitude
        descriptions {
          languageCode
          name
          altLabel
          hiddenLabel
          definition
          scopeNote
          note
        }
        broader { id }
        narrower { id }
        related { id }
      }
    }
  }
}

Dublin Core Mapping¶

DC Element	GraphQL Field	Example
`dc:title`	`descriptions.name`	"Auschwitz concentration camp"
`dc:title`	`descriptions.altLabel`	Alternative names
`dc:description`	`descriptions.scopeNote`	Scope notes
`dc:coverage`	`latitude, longitude`	`geo:50.026199,19.204099`
`dc:relation`	`broader.id`	Parent camps
`dc:relation`	`narrower.id`	Child camps
`dc:relation`	`seeAlso`	External links (e.g., Wikidata)

Example Output¶

<oai_dc:dc>
  <dc:identifier>ehri_camps-1</dc:identifier>
  <dc:identifier>url:https://portal.ehri-project.eu/keywords/ehri_camps-1</dc:identifier>
  <dc:title xml:lang="eng">Auschwitz I concentration camp</dc:title>
  <dc:title xml:lang="eng">KZ Auschwitz I</dc:title>
  <dc:type>Text</dc:type>
  <dc:type>CvocConcept</dc:type>
  <dc:relation>ehri_camps-0</dc:relation>
  <dc:coverage>geo:50.026199,19.204099</dc:coverage>
  <dc:relation>http://www.wikidata.org/entity/Q662563</dc:relation>
  <dc:rights>European Holocaust Research Infrastructure</dc:rights>
</oai_dc:dc>

Ghettos (ehri:ghettos)¶

GraphQL Query¶

query GetGhettos {
  CvocVocabulary(id: "ehri_ghettos") {
    concepts {
      items {
        id
        type
        seeAlso
        latitude
        longitude
        descriptions {
          languageCode
          name
          altLabel
          hiddenLabel
          definition
          scopeNote
          note
        }
        broader { id }
        narrower { id }
        related { id }
      }
    }
  }
}

Dublin Core Mapping¶

Identical to Camps mapping.

Example Output¶

<oai_dc:dc>
  <dc:identifier>ehri_ghettos-449</dc:identifier>
  <dc:identifier>url:https://portal.ehri-project.eu/keywords/ehri_ghettos-449</dc:identifier>
  <dc:title xml:lang="ces">Židovské ghetto Terezín</dc:title>
  <dc:title xml:lang="eng">Terezin Ghetto</dc:title>
  <dc:title xml:lang="heb">גטו טרזין</dc:title>
  <dc:title xml:lang="ita">Ghetto di Terezin</dc:title>
  <dc:title xml:lang="deu">Ghetto Theresienstadt</dc:title>
  <dc:type>Text</dc:type>
  <dc:type>CvocConcept</dc:type>
  <dc:relation>http://www.yadvashem.org/yv/he/research/ghettos_encyclopedia/ghetto_details.asp?cid=452</dc:relation>
  <dc:relation>http://www.wikidata.org/entity/Q15111616</dc:relation>
  <dc:relation>https://www.ushmm.org/wlc/en/article.php?ModuleId=10005424</dc:relation>
  <dc:rights>European Holocaust Research Infrastructure</dc:rights>
</oai_dc:dc>

Terms (ehri:terms)¶

GraphQL Query¶

query GetTerms {
  CvocVocabulary(id: "ehri_terms") {
    concepts {
      items {
        id
        type
        seeAlso
        latitude
        longitude
        descriptions {
          languageCode
          name
          altLabel
          hiddenLabel
          definition
          scopeNote
          note
        }
        broader { id }
        narrower { id }
        related { id }
      }
    }
  }
}

Dublin Core Mapping¶

DC Element	GraphQL Field	Description
`dc:title`	`descriptions.name`	Preferred term
`dc:title`	`descriptions.altLabel`	Alternative terms
`dc:description`	`descriptions.scopeNote`	Scope notes
`dc:relation`	`broader.id`	Broader terms
`dc:relation`	`narrower.id`	Narrower terms
`dc:relation`	`seeAlso`	External links

Example Output¶

<oai_dc:dc>
  <dc:identifier>ehri_terms-100</dc:identifier>
  <dc:identifier>url:https://portal.ehri-project.eu/keywords/ehri_terms-100</dc:identifier>
  <dc:title xml:lang="eng">Rescue of Jews</dc:title>
  <dc:title xml:lang="ita">Salvataggio di ebrei</dc:title>
  <dc:title xml:lang="heb">הצלת יהודים</dc:title>
  <dc:type>Text</dc:type>
  <dc:type>CvocConcept</dc:type>
  <dc:relation>ehri_terms-214</dc:relation>
  <dc:rights>European Holocaust Research Infrastructure</dc:rights>
</oai_dc:dc>

Persons (ehri:persons)¶

GraphQL Query¶

query GetPersons {
  AuthoritativeSet(id: "ehri_pers") {
    authorities {
      items {
        id
        type
        identifier
        descriptions {
          languageCode
          name
          identifier
          lastName
          firstName
          typeOfEntity
          datesOfExistence
          biographicalHistory
          place
          functions
          occupation
          otherFormsOfName
          parallelFormsOfName
          source
        }
      }
    }
  }
}

Dublin Core Mapping¶

DC Element	GraphQL Field	Description
`dc:title`	`descriptions.name`	Main name of person
`dc:title`	`descriptions.otherFormsOfName`	Other name forms
`dc:title`	`descriptions.parallelFormsOfName`	Parallel names
`dc:description`	`descriptions.biographicalHistory`	Biographical information
`dc:coverage`	`descriptions.datesOfExistence`	Life dates with `temporal:` prefix
`dc:coverage`	`descriptions.place`	Places with `spatial:` prefix
`dc:source`	`descriptions.source`	Source references

Example Output¶

<oai_dc:dc>
  <dc:identifier>ehri_pers-000001</dc:identifier>
  <dc:identifier>url:https://portal.ehri-project.eu/authorities/ehri_pers-000001</dc:identifier>
  <dc:title xml:lang="eng">Abetz Otto</dc:title>
  <dc:type>Text</dc:type>
  <dc:type>HistoricalAgent</dc:type>
  <dc:description xml:lang="eng">German ambassador in Paris since August 1940.</dc:description>
  <dc:coverage>temporal:26/03/1903-05/05/1958</dc:coverage>
  <dc:coverage>spatial:Schwetzingen, Germany</dc:coverage>
  <dc:coverage>spatial:Autobahn Cologne-Dusseldorf near Langenfeld, Germany</dc:coverage>
  <dc:source>Das Personenlexikon zum Dritten Reich / E. Klee. - Frankfurt am Main : S. Fischer, 2003. - p. 9, Biographisches Lexikon zum Dritten Reich / H. Weiß. - Frankfurt am Main : Fischer Taschenbuch Verlag, 1998. - p. 15</dc:source>
  <dc:rights>European Holocaust Research Infrastructure</dc:rights>
</oai_dc:dc>

Corporate Bodies (ehri:corporatebodies)¶

GraphQL Query¶

query GetCorporateBodies {
  AuthoritativeSet(id: "ehri_cb") {
    authorities {
      items {
        id
        type
        identifier
        descriptions {
          languageCode
          name
          identifier
          lastName
          firstName
          typeOfEntity
          datesOfExistence
          biographicalHistory
          place
          functions
          occupation
          otherFormsOfName
          parallelFormsOfName
          source
        }
      }
    }
  }
}

Dublin Core Mapping¶

DC Element	GraphQL Field	Description
`dc:title`	`descriptions.name`	Name of corporate body
`dc:title`	`descriptions.otherFormsOfName`	Alternative names
`dc:title`	`descriptions.parallelFormsOfName`	Parallel names
`dc:description`	`descriptions.biographicalHistory`	History of organization
`dc:coverage`	`descriptions.datesOfExistence`	Period of existence with `temporal:` prefix
`dc:coverage`	`descriptions.place`	Place with `spatial:` prefix
`dc:source`	`descriptions.source`	Source references

Example Output¶

<oai_dc:dc>
  <dc:identifier>ehri_cb-429</dc:identifier>
  <dc:identifier>url:https://portal.ehri-project.eu/authorities/ehri_cb-429</dc:identifier>
  <dc:title xml:lang="eng">Schutzstaffel</dc:title>
  <dc:title>Black Shirts</dc:title>
  <dc:title>SS</dc:title>
  <dc:title>SS - Schutzstaffel</dc:title>
  <dc:type>Text</dc:type>
  <dc:type>HistoricalAgent</dc:type>
  <dc:description xml:lang="eng">The Schutzstaffel was a small detachment was formed in 1925...</dc:description>
  <dc:coverage>temporal:Founded in 1925</dc:coverage>
  <dc:coverage>spatial:Founded in Germany.</dc:coverage>
  <dc:source>Dictionary of the Holocaust : Biography, geography, and terminology / E.J. Epstein, P. Rosen. – Westport, 1997. – p. 275</dc:source>
  <dc:rights>European Holocaust Research Infrastructure</dc:rights>
</oai_dc:dc>

Countries (ehri:countries)¶

GraphQL Query¶

query GetCountries {
  countries {
    items {
      id
      type
      identifier
      name
      history
      situation
      summary
      itemCount
    }
  }
}

Dublin Core Mapping¶

DC Element	GraphQL Field	Description
`dc:title`	`name`	Country name
`dc:type`	`type`	"Country"
`dc:description`	`summary`	Summary
`dc:description`	`history`	Historical context
`dc:description`	`situation`	Current archival situation

Example Output¶

<oai_dc:dc>
  <dc:identifier>de</dc:identifier>
  <dc:identifier>url:https://portal.ehri-project.eu/countries/de</dc:identifier>
  <dc:title>Germany</dc:title>
  <dc:type>Text</dc:type>
  <dc:type>Country</dc:type>
  <dc:description>Key institutions identified by EHRI include the Bundesarchiv...</dc:description>
  <dc:description>Adolf Hitler was appointed Reich Chancellor on 30 January 1933...</dc:description>
  <dc:description>Germany exhibits a highly differentiated archival system...</dc:description>
  <dc:rights>European Holocaust Research Infrastructure</dc:rights>
</oai_dc:dc>

Repositories (ehri:repositories)¶

GraphQL Query¶

query GetRepositories {
  repositories {
    items {
      id
      type
      identifier
      itemCount
      latitude
      longitude
      descriptions {
        languageCode
        name
        identifier
        addresses {
          addressName
          contactPerson
          street
          municipality
          firstdem
          countryCode
          postalCode
          telephone
          email
          webpage
        }
        history
        geoculturalContext
        mandates
        administrativeStructure
        holdings
        otherFormsOfName
        parallelFormsOfName
        conditions
        accessibility
      }
      country {
        id
      }
    }
  }
}

Dublin Core Mapping¶

DC Element	GraphQL Field	Description
`dc:title`	`descriptions.name`	Name of institution
`dc:title`	`descriptions.otherFormsOfName`	Alternative names
`dc:title`	`descriptions.parallelFormsOfName`	Parallel names
`dc:publisher`	`descriptions.addresses.contactPerson`	Contact person
`dc:coverage`	`latitude, longitude`	Geographic coordinates with `geo:` prefix
`dc:description`	`descriptions.history`	History
`dc:description`	`descriptions.geoculturalContext`	Geocultural context
`dc:description`	`descriptions.mandates`	Mandates
`dc:description`	`descriptions.administrativeStructure`	Administrative structure
`dc:description`	`descriptions.holdings`	Holdings
`dc:rights`	`descriptions.conditions`	Access conditions
`dc:relation`	`descriptions.addresses.webpage`	Website

Example Output¶

<oai_dc:dc>
  <dc:identifier>de-002624</dc:identifier>
  <dc:identifier>url:https://portal.ehri-project.eu/institutions/de-002624</dc:identifier>
  <dc:title xml:lang="eng">Institut für Zeitgeschichte–Archiv</dc:title>
  <dc:title>Institute of Contemporary History - Archives</dc:title>
  <dc:title>Institute for Contemporary History - Archives</dc:title>
  <dc:title>IfZ</dc:title>
  <dc:title>IfZ/A</dc:title>
  <dc:type>Text</dc:type>
  <dc:type>Repository</dc:type>
  <dc:description xml:lang="eng">The Institute was founded on the initiative of the American Military Government...</dc:description>
  <dc:description xml:lang="eng">Along with the research departments, a library (over 225,000 volumes) and an archives were established...</dc:description>
  <dc:relation>http://www.ifz-muenchen.de/</dc:relation>
  <dc:relation>http://archiv.ifz-muenchen.de/</dc:relation>
  <dc:rights xml:lang="eng">The archives is available for public research...</dc:rights>
  <dc:coverage>geo:48.156741013823,11.543528973844</dc:coverage>
  <dc:rights>European Holocaust Research Infrastructure</dc:rights>
</oai_dc:dc>