Revision as of 14:30, 12 April 2018

Zenodo is a portal (launched in May 2013) that collects outputs from researches in all fields of science to promote open access and open data. It is supported by the OpenAIRE initiative and developed and hosted by CERN.

Each outcome uploaded (called Deposition in the Zenodo gergo) is stored by Zenodo along with a rich set of metadata, searchable via the portal and harvestable via the OAI-PMH protocol.

Zenodo assigns to each deposition a unique Digital Object Identifier (DOI) to to make the upload easily and uniquely citeable.

gCube Community

The gCube Community is a community created with the objective of collecting all the depositions related to gCube software. New software artifacts are automatically uploaded at every gCube release and metadata is generated automatically (see #Automatic Metadata Generation).

Automatic Metadata Generation

The content for each deposition is generated automatically by the Zenodo Publisher from the information in the component source code and in ETICS.

The figure below shows the structure and the information published for each software artifact.

1. Title

The title of the deposition is built as follow:

gCube <name>

where:

• name is the content of <name> tag in the pom.xml. If not present, the artifactId is used

Previously also the component version and the gcube release were added in the title, but since the versioning of depositions is supported, this information has been removed because redundant.

2. Authors

Built from the content of "vcs.authors" property in ETICS configuration. That property is computed by ETICS looking at the VCS history of the component, If the user in ETICS has associated an ORCID identifier, it is added (Zenodo shows it as a green circle before the Author name).

3. Description

It is generated starting from the README and changelog.xml files. The two file are parsed removing redundant (e.g. license because it is published already in #14. License, source code, because it is published already in #5. GitHub link) or useless information (e.g. links to root page of the gCube wiki).

4. Files

The only file uploaded is the source package. It is generated during ETICS builds and contains everything checked-out from the VCS

5. GitHub link

The link to the position of the source code in GitHub

6. DOI

This is the unique identifier assigned by Zenodo to this deposition.

7. Keywords

Keywords for each component are stored in ETICS in the the description field of the corresponding ETICS module (not the configuration). For instance, keywords for "Common Authorization" are stored in the description of "org.gcube.common.authorization-common" module. They are encoded as follow:

#keywords=keyword1, keyword 2, key word3, ...

If keywords are not found in the component, they are searched in the subsystem and if also in the subsystem are not found, the keywords for the project are used. org.gcube project define these keywords:

#keywords=gCube, Java, Data Management System, Hybrid Data Infrastructure

8. Grants

Static list of grants. The same for all depositions

9. Binary artifact reference

A link to the binary package (stored in Nexus) generated from the compilation of the source package uploaded in #4. Files.

10. Documentation Reference

A reference to the documentation of the binary artifact. If present, this is a link to the jar file that contains the javadoc

11. GitHub Reference

(same as 5)

12. PackageId

internal identifier to uniquely identify the depositions

13. Commiunity

All depositions belongs to the gCube community

14. License

Statically set to EUPL-1.1

15. Versions

This is automatically generated by Zenodo to list all the other versions of the same component published in Zenodo.

Support for .zenodo.json file

It is possible to override all the metadata information generated automatically by adding a .zenodo.json file in the root of the source code of the component. This is a mechanism that Zenodo offers for the publication through GitHub and that we implemented also in our publisher.

The .zenodo.json file will be read after the metadata generation from the source package and each metadata field generated will be replaced by the same field in the file (if present).

Some examples of the format of the .zenodo.json file are here here

Troubleshooting

Wrong authors published

It could happen for some components that authors published in Zenodo do not match the actual authors of the components. The automated publisher takes the list of authors from the vcs.authors property in the ETICS configuration. In turn, ETICS generates the list analysing the SVN/Git commits in the component repository. The analysis is based on an implementation of the truck factor [1] that takes the authors of all the commits and weights them on the basis of the type of commits they did.

[1] https://arxiv.org/pdf/1604.06766.pdf