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nataled merged 2 commits into from
Mar 10, 2026
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Update fp-003-uris.md library->foundry #2859

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Update fp-003-uris.md library->foundry
nataled Mar 10, 2026
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Merge branch 'master' into nataled-patch-3
nataled Mar 10, 2026
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2 changes: 1 addition & 1 deletion principles/fp-003-uris.md
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Expand Up @@ -11,7 +11,7 @@ Each ontology MUST have a unique IRI in the form of an OBO Foundry persistent UR

## Purpose

A unique namespace within the OBO Foundry Library allows the source of an element or term (e.g., class, property) from any ontology to be identified immediately by the prefix of the identifier. It also allows ontology element IRIs to be shortened to a compact URI or CURIE, which allows developers to use CURIES for working with ontologies. OWL syntax allows for ontologies and their elements to have identifiers in the form of an IRI. The OBO Foundry uses IRIs in the form of PURLs to allow an ontology and its elements to be resolvable (findable on the web). PURLs are URLs (and thus locate the resource) that are permanent or redirectable, allowing the URL to point to a new location when the resource moves. OBO Foundry PURLs use a standard format that includes the ontology namespace so that they can be easily maintained by a group of volunteers, and so ontology maintainers can update the location their PURL points to using a GitHub pull request.
A unique namespace within the OBO Foundry allows the source of an element or term (e.g., class, property) from any ontology to be identified immediately by the prefix of the identifier. It also allows ontology element IRIs to be shortened to a compact URI or CURIE, which allows developers to use CURIES for working with ontologies. OWL syntax allows for ontologies and their elements to have identifiers in the form of an IRI. The OBO Foundry uses IRIs in the form of PURLs to allow an ontology and its elements to be resolvable (findable on the web). PURLs are URLs (and thus locate the resource) that are permanent or redirectable, allowing the URL to point to a new location when the resource moves. OBO Foundry PURLs use a standard format that includes the ontology namespace so that they can be easily maintained by a group of volunteers, and so ontology maintainers can update the location their PURL points to using a GitHub pull request.

## Recommendations and Requirements

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