BioPortal provides access to commonly used biomedical ontologies and to tools for working with them. BioPortal allows you to
- browse the library of ontologies (the “Browse” tab)
- search for a term across multiple ontologies (the “Search” tab)
- examine mappings between terms in different ontologies (the “Mappings” tab)
- receive recommendations on which ontologies are most relevant for a corpus (the “Recommender” tab)
- annotate text with terms from ontologies (the “Annotator” tab)
- search for a particular term in selected biomedical resources (the “Resource Index” tab)
- browse a selection of projects that use BioPortal resources (the “Projects” tab)
Everything available through the BioPortal application is also available through our REST API.
To find a particular ontology quickly, begin typing the ontology name or abbreviation in the “Filter by Text” field. You can also narrow the list of ontologies shown by selecting a specific “category” (a domain) or a “group” to which the ontology belongs.
To submit an ontology press the “Submit New Ontology” button. You must be logged in to BioPortal to submit an ontology.
You can subscribe to receive RSS updates when any ontology in the system changes by clicking the subscribe link. You can subscribe to updates for a particular ontology from the summary page for that ontology. To go to the summary page click on the ontology name.
Accessing Controlled Ontologies
Some submitters do not want everyone to be able to browse their ontology terms. These ontologies are marked with visibility “Private” or “Licensed”. To browse the terms in these ontologies you must be both
- logged in to BioPortal
- granted access to the ontology
The ontology submitter directly controls access to private ontologies. Please contact the submitter to gain access to a private ontology. The submitter indirectly controls access to licensed ontologies. When you attempt to access a licensed ontology, the system will prompt you to enter the license information required by the submitter. When you have entered the required information, the system will allow you to access the ontology.
In addition, there is a visibility value “Summary Only”. The terms for these ontologies are not available in BioPortal; we only have the summary information. Please contact the ontology submitter for more information about these ontologies.
Web Service Access
To access this information programmatically, see our <ontology summary REST API documentation.>
Enter the full or partial name of a term in the search box. To search across all ontologies simply hit the Search button. The system looks for matches in the term name, synonyms, term ids, and in property values. You can filter the returned values by ontology or by the type of match by selecting one of the filter links in the output table.
Filtering by Ontologies
If you want to only search in a subset of ontologies you can specify the desired ontologies in the Ontologies box. (Note that it is no faster to search a subset than to search all ontologies.) Simply type in the ontology name or acronym to chose the desired ontology. You can also select from a list of all ontologies using the “select from list” link.
Web Service Access
To access this information programmatically, see our search REST API documentation.
- Mappings Defined
Mappings are associations between two or more terms in different ontologies. This association typically represents a degree of similarity between the terms but this meaning is not required. The author of the mapping defines the semantics of a particular mapping. It is also usual for a mapping to be bi-directional, but again, this is not required. The mapping author defines directionality.
- Exploring Mappings
To examine mappings for an ontology, select it from the dropdown list. You will then see a table showing all ontologies for which at least one mapping exists between the two ontologies. Select an ontology from this table to browse the mappings between the two ontologies.
- Web Service Access
To access this information programmatically, set the mappings REST API documentation.
Ontology recommendation is also available programmatically through our REST API.
The annotator accepts a selection of text and annotates it with terms from ontologies. The system matches words in the text to terms in ontologies by doing an exact string comparison (a “direct” match) between the text and ontology term names, synonyms, and ids.
In addition to the straightforward direct matches, the user may expand the set of matches by including matches from mapped terms and from hierarchical expansion. For most ontologies (OWL and UMLS RRF) the system performs the hierarchical expansion on the superclass (“is-a”) relationship. For OBO ontologies the hierarchical expansion also includes the part-of relationship. You use the “number of levels” field to control the number of levels up the hierarchy for which the system will return terms for a given match.
Web Service Access
The annotator is available programmatically through our REST API.