This project adds a UCUM Datatype in Apache Jena, along with different utility SPARQL functions.
A valid UCUM literal consists of the concatenation of:
- a valid xsd:decimal
- a space
- a valid code for unit of measure as defined in http://unitsofmeasure.org/ucum.html
Any unit that is valid for UCUM is valid for Jena-UCUM!
Examples of valid UCUM literals:
@Prefix cdt: <https://w3id.org/cdt/>.
"1 [ft_i]"^^cdt:ucum -- foot, International customary units
"1.0 [ft_br]"^^cdt:ucum -- foot, British Imperial lengths
"10e-1 um"^^cdt:ucum -- micrometer
"-2.47e-4 L/(min.m2)"^^cdt:ucum -- liter per minute and square meter
"0.7 km/s"^^cdt:ucum --> kilometer per second
"10.54 %"^^cdt:ucum --> percents
"37.5 Cel"^^cdt:ucum --> degree Celsius
"2.45e-1 [in_i'Hg]"^^cdt:ucum , or equivalently, "2.45e-1 m[Hg].[in_i]/m"^^cdt:ucum --> inch of mercury column
"1.5647e6 {rbc} "^^cdt:ucum -- red blood cell count
For the compete specification of UCUM code system:
http://unitsofmeasure.org/ucum.html
You can use native SPARQL operators (=, <, etc.) to compare UCUM literals.
To use, follow these steps:
First, clone the repository and install project locally (requires Git and Maven)
git clone [email protected]:OpenSensingCity/jena-ucum.git
cd jena-ucum
mvn installThen, add the following to your Maven project's pom.xml:
<properties>
<!-- the version of jena you are using (mini 3.x) -->
<jena.version>3.6.0-ucum</jena.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.jena</groupId>
<artifactId>jena-arq</artifactId>
<version>3.6.0-ucum</version>
</dependency>
</dependencies>- Gunther Schadow and Clement J. McDonald for their work on the Unified Code for Units of Measures - http://unitsofmeasure.org/ucum.html
- Werner Keilw and Magno N. A. Cruz for their implementation of UCUM on Java SE - https://github.com/unitsofmeasurement/uom-systems