--- sidebar_position: 1 --- # CfHbKeyValue Information about the sources from which the record has been collected. @JsonSchema(description = "the OpenAIRE identifier of the data source") ### key _Type: String • Cardinality: ONE_ the OpenAIRE identifier of the data source ```json "key":"openaire____::081b82f96300b6a6e3d282bad31cb6e2" ``` ### value _Type: String • Cardinality: ONE_ The name of the data source. ```json "value":"Crossref" ```