OntoCheck 0.0.5.0

A package for assessing the quality and structure of ontologies.

OntoCheck

Query-Driven Ontology Assessment for Scientific Domain Applications

---

Overview

As scientific fields increasingly adopt FAIR data principles, ontologies have become essential for encoding the semantics of scientific investigations. Yet evaluating ontology quality remains a manual, technically demanding bottleneck. Current frameworks emphasize structural correctness but fail to assess practical utility against the real-world queries posed by domain scientists.

OntoCheck is an open-source Python tool that unifies domain-agnostic structural metrics with a novel, query-driven assessment methodology. By analyzing SPARQL queries derived from natural-language competency questions, OntoCheck compares the required query terms against an ontology's full vocabulary to yield complementary metrics for vocabulary coverage and utilization density. This empowers domain scientists and data engineers to make evidence-based decisions about ontology selection without requiring deep expertise in formal knowledge representation.

OntoCheck is actively developed and maintained by the SDLE Research Center at Case Western Reserve University.

---

Installation

pip install OntoCheck

Requirements: Python 3.8 or later.

---

Quick Start

Command-Line Interface

# Display available metrics and usage information
ontocheck -h

# Run specific metrics on an ontology file
ontocheck path/to/ontology.ttl --metrics altLabelCheck definitionCheck

# Run all available task-agnostic metrics
ontocheck path/to/ontology.ttl --metrics all

# Specify custom output file paths
ontocheck path/to/ontology.ttl --metrics all --log-file results.log --csv-file results.csv

Python API

from ontocheck import run_ontology_assessment

# Run selected metrics
run_ontology_assessment(
    ttl_file="path/to/ontology.ttl",
    metrics=["altLabelCheck", "definitionCheck", "isolatedElements"],
)

# Run all task-agnostic metrics
run_ontology_assessment(
    ttl_file="path/to/ontology.ttl",
    metrics="all",
)

Task-Based Assessment

from ontocheck import task_based_metric_v_0_0_1

result = task_based_metric_v_0_0_1(
    ttl_file="path/to/ontology.ttl",
    questions="competency_questions.json",
    domain_prefixes=["mds"],
    domain_ns_fragments=["cwrusdle.bitbucket.io/mds"],
)

print(f"Relevance: {result['relevance']:.2%}")
print(f"Accuracy:  {result['accuracy']:.2%}")

---

Available Metrics

OntoCheck provides 17 task-agnostic metrics organized into four categories, along with a task-based assessment methodology.

Labeling

Metric	Function	Description
checkLabel	mainLabelCheck_v_0_0_1	Proportion of named classes carrying human-readable identifiers
altLabelCheck	mainAltLabelCheck_v_0_0_1	Proportion of named classes carrying synonyms
definitionCheck	mainDefCheck_v_0_0_1	Proportion of named classes carrying formal definitions

Structural

Metric	Function	Description
isolatedElements	check_for_isolated_elements	Identifies orphaned classes within the ontology
classConnections	count_class_connected_components	Identifies disconnected subgraphs
missingDomainRange	get_properties_missing_domain_and_range	Identifies undeclared domain and range restrictions
leafNodeCheck	mainLeafNodeCheck_v_0_0_1	Identifies all leaf nodes in the ontology hierarchy
semanticConnection	mainSemanticConnection_v_0_0_1	Verifies grounding in upper-level ontologies (e.g., CCO, BFO)

Accessibility

Metric	Function	Description
sparqlEndpoint	check_sparql_accessibility_ttl	Verifies reachability of the SPARQL endpoint
rdfDump	check_rdf_dump_accessibility_ttl	Verifies availability of the RDF data dump
humanLicense	check_human_readable_license_ttl	Verifies presence and fitness of licensing information
externalLinks	check_external_data_provider_links_ttl	Checks validity of external links within the ontology

Naming Convention

Metric	Function	Description
classCapitalCheck	mainClassNameCapitalCheck_v_0_0_1	Flags departures from standard capitalization
classSpaceCheck	mainClassNameSpaceCheck_v_0_0_1	Flags use of spaces in class identifiers
spellCheck	spell_check_v_0_0_1	Spell checking on labels and definitions
duplicateLabels	find_duplicate_labels_from_graph	Identifies duplicate labels across entities
searchClass	mainClassSearch_v_0_0_1	Identifies classes matching a user-specified string

Task-Based Assessment

The task-based methodology measures how well an ontology supports analytical queries by computing two complementary metrics from SPARQL competency questions:

• Relevance = |T_a intersection T_o| / |T_a| -- the fraction of task-required terms that the ontology defines
• Accuracy = |T_a intersection T_o| / |T_o| -- the fraction of ontology terms utilized by the task queries

where T_a is the set of domain terms extracted from the SPARQL queries and T_o is the set of domain terms defined in the ontology.

---

Documentation

Full documentation is available at ontocheck.readthedocs.io.

---

Authors

• Rishabh Kundu
• Redad Mehdi
• Van D. Tran
• Ethan Frakes
• Abhishek Daundkar
• Maliesha Sumudumalie
• Vibha S. Mandayam
• Jacob A. Lample
• Mengjie Li
• Laura S. Bruckman
• Erika I. Barcelos
• Alp Sehirlioglu
• Roger H. French
• Yinghui Wu

Affiliation

Materials Data Science for Stockpile Stewardship Center of Excellence (MDS3 COE), Case Western Reserve University, Cleveland, OH 44106, USA

---

Acknowledgments

• U.S. Department of Energy's National Nuclear Security Administration -- Award Number DE-NA0004104 and Contract Number B647887
• U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Solar Energy Technologies Office (SETO) -- Agreement Numbers DE-EE0009353 and DE-EE0009347
• U.S. National Science Foundation -- Award Number 2133576

---

How to Cite

If you use OntoCheck in your work, please cite:

Rishabh Kundu, Redad Mehdi, Van D. Tran, Ethan Frakes, Abhishek Daundkar, Maliesha Sumudumalie, Vibha S. Mandayam, Jacob A. Lample, Mengjie Li, Laura S. Bruckman, Erika I. Barcelos, Alp Sehirlioglu, Roger H. French, Yinghui Wu (2025). OntoCheck: Query-Driven Ontology Assessments for Scientific Domain Applications. [Python]. https://pypi.org/project/OntoCheck/

---

License

OntoCheck is released under the BSD-2-Clause License.