# Quantities, Units, Dimensions and Types (QUDT) Schema - Version 2.0 (QUDT2)

> The QUDT, or "Quantity, Unit, Dimension and Type" schema defines the base classes properties,...

- Page: https://library.schematica.io/model/ca980dd4a5a4478daa228bc50245a06d
- Model type: Ontology
- License: Apache 2.0
- Access type: Free
- Access method: Download
- Model size: Small
- Formats: OWL
- Domains: Tech / IT
- Audiences: Developer, Researcher
- External link: https://bioportal.bioontology.org/ontologies/QUDT2
- Contact: John Graybeal (jgraybeal@stanford.edu)
- Listed in library: 2025-06-12
- Last updated: 2025-09-10

## Description

## Ontology Info

| Field | Value |
|-------|-------|
| Acronyme | QUDT2 |
| Description | The QUDT, or "Quantity, Unit, Dimension and Type" schema defines the base classes properties, and restrictions used for modeling physical quantities, units of measure, and their dimensions in various measurement systems. The goal of the QUDT ontology is to provide a unified model of, measurable quantities, units for measuring different kinds of quantities, the numerical values of quantities in different units of measure and the data structures and data types used to store and manipulate these objects in software.<br><br>Except for unit prefixes, all units are specified in separate vocabularies.  |
| Format | OWL |
| Categories | Upper Level Ontology |
| Groups |  |

## Metrics

| Metric | Value |
|--------|-------|
| Classes | 114 |
| Individuals | 95 |
| Properties | 192 |
| Max Depth | 4 |
| Max Child Count | 34 |
| Average Child Count | 3 |
| Classes With One Child | 14 |
| Classes With More Than 25 Children | 1 |
| Classes With No Definition | 105 |

## Projects using QUDT2

No projects using QUDT2

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Source: https://library.schematica.io/model/ca980dd4a5a4478daa228bc50245a06d