The EU BON Portal integrates biodiversity observation systems under one search facility. The portal offers a spatially, temporally, and taxonomically oriented user interface to locate biodiversity datasets. See


Many national or thematic metadata catalogues exist, which can easily share their data through EU BON, and hence, through GEOSS Here is how various metadata catalogues can link their data with EU BON. We would suggest one of two alternatives:

  1. Ecological Metadata Language (EML): Create a EML harvest list, that is, a simple XML file linking each EML file, e.g., see

  2. ISO 19115: Use GeoNetwork, or similar software, to expose metadata as an OGC CSW service.

If you start from scratch and have no other uses for the metadata, go for the first option. As a manual exercise, map your metadata fields to EML elements. It requires title and short description of the dataset, contact information, spatial, temporal, and taxonomic coverage, and optionally some description of the observation methods used. Then programmatically from your own database generate one EML document for each metadata entry. Finally, generate the EML harvest list following the above example. Guidance for EML is available here


If you are sharing your metadata through INSPIRE or other mechanisms, you may want to use ISO 19115. The EU BON Portal can also consume other formats, such as OAI-PMH, OpenSearch, etc. If you already have those formats available, you can instead use them.


Once you have your metadata ready for harvesting or just testing, please inform EU BON Portal administrator using the contact form