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OntoLogos

QL API

eddiethedean/ontologos

OWL QL API Reference¶

Conjunctive query answering via ontologos-ql.

Requires a classified ontology (Taxonomy from EL or DL classification).

Parse a query¶

use ontologos_ql::parse_conjunctive_query;

let query = parse_conjunctive_query("Type(?x, http://ex.org/A)")?;

Limits: MAX_QUERY_LEN, MAX_QUERY_ATOMS (see docs.rs).

Answer a query¶

use ontologos_ql::{answer_query, parse_conjunctive_query};

let query = parse_conjunctive_query("Type(?x, http://ex.org/Person)")?;
let answers = answer_query(&ontology, &taxonomy, &query)?;

Each QueryAnswer binds query variables to entity IDs.

CLI¶

ontologos query --query 'Type(?x, http://ex.org/A)' ontology.owl

Requires prior classification or uses profile routing internally — see CLI reference.

Errors¶

Variant	Cause
`UnknownClass`	Class IRI not in ontology
`Parse`	Invalid query syntax
`Query`	Wrapped hierarchy navigation error