Technical information for Leibniz institutions

The institutions operating LeibnizOpen have come together to agree on different standards to coordinate and unify as much as possible the way in which metadata is harvested from the individual disciplinary repositories and then presented in LeibnizOpen. The following overview details instructions and implementation strategies which institutions should follow if they want to integrate their repositories into LeibnizOpen or connect via repositories which are not hosted by Leibniz institutes.

Metadata Schema

A common schema for metadata has been agreed upon so that the different metadata from numerous disciplinary repositories can all be processed together in future. This schema is based on the Dublin Core Metatdata Element Set but adds 3 elements to the 15 elements in the set: “wglsubject”, “wgltype“ and “wglcontributor”. These three fields are mandatory fields and should contain the following entries:

  • “wglcontributor”: This field should contain the abbreviation of the Leibniz institution to which the author belongs. The abbreviations are identical to the abbreviations used within the Leibniz Association. In the case of a joint publication by authors from different institutions, an entry should be made for each institution.
  • “wgltype”: This field should contain the document type as defined in the vocabulary of document types for LeibnizOpen.
  • “wglsubject”: This field should contain one or more entries as defined in the LeibnizOpen subject classification. An entry should be made for each discipline in interdisciplinary publications.

For the final two fields “wgltype” and “wglsubject”, subject-specific repositories might have to produce and implement an internal mapping which the document types and disciplines (which can remain in the DC fields “type” and “subject”) can reproduce on the corresponding entries of the Leibniz document lists and subject classification.

As a result of the changes and developments of the Dublin Core Schema, the namespace has been changed from “dc” to “wgl”. This means that the operators of the repositories involved only have to generate one output according to the new schema and do not have to change their own standardised output formats (e.g. the prefix “oai_dc”). The metadata scheme described above is available at: and

The second website defines the current 18 metadata fields of the common LeibnizOpen metadata schema.

OAI interface

The metadata held by the repositories involved can be accessed via their respective OAI interface. Only the metadata for documents which fulfil the framework conditions should be made accessible to LeibnizOpen under the prefix “oai_wgl”. The metadata should be transmitted according to the schema defined above. It is also possible to sort the data into sets.

Metadata visibility and accessibility

Once the metadata has been harvested and presented in LeibnizOpen, it becomes visible on the web and accessible to web search engines. Thanks to the provision of its own OAI interface, metadata can be harvested so that it is available to external providers and services as well as the institutions of the Leibniz Association themselves. These can, for example, integrate their own metadata into their webpages. The data can be harvested at

File format of full-text versions

Full-text versions must be submitted as PDFs.

Contact Person

Mahan Zolghadr, GESIS

Subject classification for LeibnizOpen

  • Agriculture
  • Art, Culture
  • Chemistry
  • Computer Science
  • Economics
  • Education
  • Engineering Sciences
  • Environmental Sciences
  • Geo Sciences
  • History
  • Language, Linguistics
  • Life Sciences, Biology
  • Literature
  • Marine Science
  • Mathematics
  • Medicine, Health
  • Nutrition Science
  • Physics
  • Psychology
  • Religious Studies
  • Spatial Sciences
  • Social Sciences

Vocabulary of document types for LeibnizOpen

  • Book / Collective volume
  • Book chapter / Contribution to a collective volume
  • Contribution to proceedings
  • Journal
  • Journal article
  • Other
  • Patent
  • Proceedings
  • Report / Research paper / Working paper
  • Thesis