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Hierarchical Event Descriptor Ontology

HED (Hierarchical Event Descriptors) is a standardized vocabulary and supporting infrastructure for annotating experimental metadata and mapping it into the experimental timeline. See HED resources for more information about the HED project.

HED schemas and the HED ontology

HED itself consists of a standard vocabulary the (HED standard schema) and specialized subfield vocabularies (HED library schemas). These vocabularies are developed and maintained in the hed-schemas GitHub repository.

The HED ontology is a representation of the HED schemas as a formal ontology of the HED information space. Releases of new HED schemas trigger a generation of a new HED ontology in this repository (hed-ontology), and maintainers of this repository do a new release. The correspondence between the HED schemas and HED ontology is explained more fully in The HED ontology chapter of the **hed-specification.

HED namespaces and IRIs

Each HED entity in the HED information space has a globally unique identifier of the form HED_xxxxxxx where xxxxxxxx is a 7-digit number.

The identifier namespace is assigned as follows:

Schema ID Range Description
Structure 0000001 - 0009999 Structure elements for HED ontology.
Standard 0010001 - 0039999 Standard annotation of experiments.
Score 0042000- 0059999 Annotation by clinical neurologists.
Lang 0062000 - 0079999 Annotation of language stimuli.

Ontology versions

Version Contains Files Description
2024-06-10 8.3.0 hed.owl
hed-standard.owl
Contains only the standard schema

PURLS

These are the PURL values relative to the

PURL Relative path
https://purl.org/hed/hed.owl ./hed.owl
https://purl.org/hed/hed-standard.owl ./hed-standard.owl
https://purl.org/hed/releases/2024-06-10/hed.owl ./releases/2024-06-10/hed.owl
https://purl.org/hed/releases/2024-06-10/hed-standard.owl ./releases/2024-06-10/hed-standard.owl

Contact

In general, posts to our GitHub issue tracker are recommended, however, if needed, you can contact the ontology curator by sending an e-mail mailto:[email protected].

License

Creative Commons License

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