# Type: Nodeidentifier _A URI, CURIE or BNODE that represents a node in a model._ URI: [shex:nonLiteral](http://www.w3.org/ns/shex#nonLiteral) * [base](https://w3id.org/linkml/base): NodeIdentifier * [uri](https://w3id.org/linkml/uri): shex:nonLiteral * [repr](https://w3id.org/linkml/repr): str ## Identifier and Mapping Information ### Schema Source * from schema: https://w3id.org/oak/taxon_constraints