These assertions are based on direct experimental evidence obtained through exometabolomic analyses. Currently, the database containes results from carefully curated mass spectrometry datasets from the Northen Metabolomics Lab located at the Joint Genome Institute, a DOE National User Facility of Lawrence Berkeley National Laboratory. WoM captures assertions: metabolite compositions of environments and the changes to metabolite abundances metabolites by organisms in the environment. It is important to note that these transformations are only interpretable in the context of the specific environment since the manner in which an organism may interact with a metabolite in one environment may differ in another.
Kosina SM, Greiner A, Lau RK, Jenkins S, Baran R, Bowen BP, Northen TR. Web of Microbes (WoM): a curated microbial exometabolomics database for linking chemistry and microbes. BMC Microbiology, September 12, 2018. DOI: 10.1186/s12866-018-1256-y