Datacite

This section describes the aggregation workflow used to gather the bibliographic material from Datacite and the relative mapping.

Datacite datasource

Datacite is a leading global non-profit organisation that provides persistent identifiers (DOIs) for research data and other research outputs.

Datacite API

The DataCite REST API allows users to retrieve, query, and browse Datacite metadata records. In particular, it exposes a method for harvesting new records incrementally.

https://api.datacite.org/dois?page[cursor]=$CURSOR&page[size]=$NUMBER_OF_ITEM_PER_PAGE&query=updated:[$FROM_DATE_TIMESAMP TO $TO_DATE_TIMESAMP]

On this API Request, we introduce some variables:

• CURSOR: The value of the cursor to iterate the pages; the cursor is extracted from each API response and used in the next request.
• NUMBER_OF_ITEM_PER_PAGE: (max 1000) defines how many records must be returned within each API response.
• FROM_DATE_TIMESAMP, TO_DATE_TIMESAMP interval timestamp of the updated record.

Each record contains two pieces of information needed for incremental harvesting:

• isActive: tells if the record is deleted (isActive:false)
• updated: timestamp of last update

Collection Workflow

The collection workflow is responsible for aggregating new records. Each record is stored locally on a table with the following schema:

• DOI: The DOI of the Datacite record (it is the primary key)
• update_timestamp: the last update date timestamp
• json: the native record JSON

The metadata collection process identifies the most recent record date available locally and uses such date to requests the records to the Datacite API, populating the FROM_DATE_TIMESAMP variable. The records in the API response are included in the local storage in upsert mode.

Datacite Mapping

Entity Mapping

The table below describes the mapping from the XML baseline records to the OpenAIRE Research Graph dump format.

OpenAIRE Result field path	Datacite record JSON path	# Notes
id	\attributes\doi	id in the form doi_________::md5(doi)
instance instance.type	\attributes\types\resourceType \attributes\types\resourceTypeGeneral attributes\types\schemaOrg	Use the vocabulary dnet:publication_resource to find a synonym to one of these terms and get the instance.type.
type	\attributes\types\resourceType \attributes\types\resourceTypeGeneral attributes\types\schemaOrg	Using the dnet:result_typologies vocabulary, we look up the instance.type synonym to generate one of the following main entities: publication dataset software otherresearchproduct
pid	\attributes\doi	scheme = doi
originalid	\attributes\doi
dateofcollection	attributes\updated	the timestamp is defined in milliseconds we convert to "yyyy-MM-dd'T'HH:mm:ssZ" format
author	\attributes\creators	Each creator field will be mapped in the author entity below the subfield. If the record has no Creator it will be skipped
author.fullname	\attributes\creators\name	if name is not defined, we construct from given and family name
author.rank		Incremental index starting from 1
author.name	\attributes\creators\givenName
author.surname	\attributes\creators\familyName
author.pid	\attributes\creators\nameIdentifiers	this is a list of pids associated to the creator
author.pid.scheme	\attributes\creators\nameIdentifiers	mapping with vocabulary dnet:pid_types
author.pid.value	\attributes\creators\nameIdentifiers/nameIdentifier	the pid value
maintitle	\attributes\titles	Titles whose title type is null or title type is Main
subtitle	\attributes\titles	Titles whose title type is Subtitle since the title type vocabulary in OpenAIRE use the datacite title type vocabulary
date section		for each date in particular for DOI starting with 10.14457 we Apply a fix thai date convert a date to ThaiBuddhistDate and reformat to local one see ticket #6791
publicationdate	\attributes\dates	where dateType is issued
publicationdate	\attributes\publicationYear	we create this date format 01-01-publicationYear
embargoenddate	\attributes\dates	where dateType is available
subjects	\attributes\subject	scheme=keywords
description	\attributes\descriptions
publisher	\attributes\publisher
language	\attributes\language	cleaned by using vocabulary dnet:languages
publisher	\attributes\publisher
instance.license	\attributes\rightsList	if the rights value starts with http and matches a particular regex
instance.accessright	\attributes\rightsList	if not present :unknown if datasource is Figshare:open If embargo_date < today(): OPEN

Relation Mapping

OpenAIRE Relation Semantic and inverse	Datacite record JSON path	Source/Target type	#Notes
isProducedBy/produces	attributes\fundingReferences	result/project	only when the fundingReferences matches the pattern (info:eu-repo/grantagreement/ec/h2020/)(\d{6})(.*)
IsProvidedBy/provides		result/datasource	Datasource is always set to Datacite
isHostedBy/host	\attributes\relationships\client\id	result/datasource	we defined a curated map clientId/Datasource if we found a match we create an hostedBy Relation
isRelatedTo	\attribute\relatedIdentifiers	result/result	we create relationships whenever the pid of the target is resolved on the Research Graph