This year, metadata development is one of our key priorities and we’re making a start with the release of version 5.4.0 of our input schema with some long-awaited changes. This is the first in what will be a series of metadata schema updates.
What is in this update?
Publication typing for citations
This is fairly simple; we’ve added a ‘type’ attribute to the citations members supply. This means you can identify a journal article citation as a journal article, but more importantly, you can identify a dataset, software, blog post, or other citation that may not have an identifier assigned to it. This makes it easier for the many thousands of metadata users to connect these citations to identifiers. We know many publishers, particularly journal publishers, do collect this information already and will consider making this change to deposit citation types with their records.
Every year we release metadata for the full corpus of records registered with us, which can be downloaded for free in a single compressed file. This is one way in which we fulfil our mission to make metadata freely and widely available. By including the metadata of over 165 million research outputs from over 20,000 members worldwide and making them available in a standard format, we streamline access to metadata about scholarly objects such as journal articles, books, conference papers, preprints, research grants, standards, datasets, reports, blogs, and more.
Today, we’re delighted to let you know that Crossref members can now use ROR IDs to identify funders in any place where you currently use Funder IDs in your metadata. Funder IDs remain available, but this change allows publishers, service providers, and funders to streamline workflows and introduce efficiencies by using a single open identifier for both researcher affiliations and funding organizations.
As you probably know, the Research Organization Registry (ROR) is a global, community-led, carefully curated registry of open persistent identifiers for research organisations, including funding organisations. It’s a joint initiative led by the California Digital Library, Datacite and Crossref launched in 2019 that fulfills the long-standing need for an open organisation identifier.
We began our Global Equitable Membership (GEM) Program to provide greater membership equitability and accessibility to organizations in the world’s least economically advantaged countries. Eligibility for the program is based on a member’s country; our list of countries is predominantly based on the International Development Association (IDA). Eligible members pay no membership or content registration fees. The list undergoes periodic reviews, as countries may be added or removed over time as economic situations change.
Crossref began its service by linking publications to other publicationsvia references.Today, this extends to relationships with associated entities. People (authors, reviewers, editors, other collaborators), funders, and research affiliations are important players in this story. Other metadata also figure prominently in it as well: references, licenses and access indicators, publication history (updates, revisions, corrections, retractions, publication dates), clinical trial and study information, etc. The list goes on.
What is lesser known (and utilized) is that Crossref is increasingly linking publications to associated scholarly artifacts. At the bottom of it all, these links can help researchers better understand, reproduce, and build off of the results in the paper. But associated research objects can enormously bolster the research enterprise in many ways (e.g., discovery, reporting, evaluation, etc.).
With all the relationships declared across all 80+ million Crossref metadata records, Crossref creates a global metadata graph across subject areas and disciplines that can be used by all.
Research article nexus
As research increasingly goes digital, more research artifacts associated with the formal publication are stored or shared online. We see a plethora of materials closely connected to publications, including: versions, peer reviews, datasets generated or analysed in the research, software packages used in the analysis, protocols and related materials, preprints, conference posters, language translations, comments, etc. Occasionally, these resources are linked from the publication. But very rarely are these relationships made available beyond the publisher platform.
Crossref will make these relationships available to the broader research ecosystem. When publishers register content for a publication, they can identify the associated scholarly artifacts directly in the article metadata. Doing so not only groups digital objects together, but formally associates with the publication. Each link is a relationship and the sum of all these relationships constitutes a “research article nexus.”
An assortment of connections already abound in the wild today. Examples include:
To date, almost all these relationships are not directly recorded in the article metadata (great job, PeerJ!). And as a result, they are more than likely “invisible” to the broader scholarly research ecosystem. Publishers can remedy these gaps by depositing associations when registering content with Crossref or updating the records after registration. That is how the article nexus is formed.
The mechanism of declaring these relationships is straightforward and a longstanding part of the standard deposit process. For each associated research object, simply provide the identifier and identifier type for the object, an optional description of it, as well as name the relationship into the metadata record. For the latter, Crossref and DataCite share a closed list of relationship types, which ensures interoperability between mappings. See Crossref technical documentationfor more details.
We maintain a list of the recommended relation typesfor a host of associated research objects to promote standardization across publishers. If you have relationships not specified, please contact us at feedback@crossref.orgto identify a suitable one considered best practice. Common adoption of relation types will make relationship metadata useful to tool builders and systems. For example, programmatic queries on supporting materials require proper tagging of their respective relationship types.
This approach is highly extensible and accommodates the introduction of new research object forms as they emerge. It also supports associated research objects regardless of identifier type. When an associated entity has a DOI, however, we can validate the relationship during metadata processing as well as provide a more reliable representation of the article nexus.
Article nexus: a far richer scholarly map
Bibliographic metadata is like a ship’s manifest that catalogs each item of cargo in a ship’s hold - crate, drum, sack, and barrel. It identifies the components that have an internal relation to the publication (contributor, funder, article update, license, etc.), each of which are well-understood points on the scholarly map. But when we integrate the article nexus into the graph, new territories become visible - not isolated islands, but places with highways connecting them to addresses already known.
When a publication has its relationships clearly identified, the connections both go out as well as lead back to it. The more connections, the more visibility on the scholarly map, as the Art of Cartographygoes. Numerous systems tap into this map: publishing, funders, research institutions, research councils, indexers & repositories, indexers, research information systems, lab & diagnostics systems, reference management and literature discovery, other PID suppliers. So publishers, you can provide the fullest value to your own publishing operation, your authors, their research communities, and the overall research enterprise by ensuring that all publications are fully linked both inside and out.
