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Class: Attribute

A property or characteristic of an entity. For example, an apple may have properties such as color, shape, age, crispiness. An environmental sample may have attributes such as depth, lat, long, material.

URI: biolink:Attribute


Identifier prefixes



  • is_a: Annotation - Biolink Model root class for entity annotations.

Uses Mixins

  • mixin: OntologyClass - a concept or class in an ontology, vocabulary or thesaurus. Note that nodes in a biolink compatible KG can be considered both instances of biolink classes, and OWL classes in their own right. In general you should not need to use this class directly. Instead, use the appropriate biolink class. For example, for the GO concept of endocytosis (GO:0006897), use bl:BiologicalProcess as the type.


Referenced by class



  • name 0..1
    • Description: A human-readable name for an attribute or entity.
    • Range: LabelType
    • in subsets: (translator_minimal,samples)
  • has attribute type 1..1
    • Description: connects an attribute to a class that describes it
    • Range: OntologyClass
    • in subsets: (samples)
  • has qualitative value 0..1
    • Description: connects an attribute to a value
    • Range: NamedThing
    • in subsets: (samples)

Inherited from chemical exposure:

Inherited from entity:

  • id 1..1
    • Description: A unique identifier for an entity. Must be either a CURIE shorthand for a URI or a complete URI
    • Range: String
    • in subsets: (translator_minimal)
  • iri 0..1
    • Description: An IRI for an entity. This is determined by the id using expansion rules.
    • Range: IriType
    • in subsets: (translator_minimal,samples)
  • category 0..*
    • Description: Name of the high level ontology class in which this entity is categorized. Corresponds to the label for the biolink entity type class.
  • In a neo4j database this MAY correspond to the neo4j label tag.
  • In an RDF database it should be a biolink model class URI. This field is multi-valued. It should include values for ancestors of the biolink class; for example, a protein such as Shh would have category values biolink:Protein, biolink:GeneProduct, biolink:MolecularEntity, … In an RDF database, nodes will typically have an rdf:type triples. This can be to the most specific biolink class, or potentially to a class more specific than something in biolink. For example, a sequence feature f may have a rdf:type assertion to a SO class such as TF_binding_site, which is more specific than anything in biolink. Here we would have categories {biolink:GenomicEntity, biolink:MolecularEntity, biolink:NamedThing}
  • type 0..1
  • description 0..1
    • Description: a human-readable description of an entity
    • Range: NarrativeText
    • in subsets: (translator_minimal)
  • source 0..1
  • has attribute 0..*
    • Description: connects any entity to an attribute
    • Range: Attribute
    • in subsets: (samples)

Domain for slot:

Other properties

In Subsets:   samples
Exact Mappings:   SIO:000614