This element intends to represent the evidence for an assertion such as an observation of a PhenotypicFeature. We recommend the use of terms from the Evidence & Conclusion Ontology (ECO)

Data model

Definition the Evidence element
Field Type Multiplicity Description
evidence_code OntologyClass 1..1 An ontology class that represents the evidence type. REQUIRED.
reference ExternalReference 0..1 Representation of the source of the evidence


        id: "ECO:0006017"
        label: "author statement from published clinical study used in manual assertion"
        id: "PMID:30962759"
        description: "Recurrent Erythema Nodosum in a Child with a SHOC2 Gene Mutation"



For example, in order to describe the evidence for a phenotypic observation that is derived from a publication, one might use the ECO term author statement from published clinical study used in manual assertion (ECO:0006017) and record a PubMed id in the reference field (See ExternalReference).


An ExternalReference is used to store a reference to the publication or other source that supports the evidence. Not all types of evidence will have an external reference, and therefore this field is optional.