Since the release of version 1.10, Ontop has been deployed to the central maven repository.

All artifacts have the groupId it.unibz.inf.ontop.

The artifactsId's are ontop, ontop-obdalib-core, ontop-obdalib-owlapi3, ontop-obdalib-protege4, ontop-obdalib-sesame, ontop-obdalib-r2rml, ontop-quest-db, ontop-quest-owlapi3, ontop-quest-sesame, ontop-reformulation-core.

You may want to check the up-to-date info at the following link:

https://oss.sonatype.org/index.html#nexus-search;quick~ontop

For instance, if you want to use the owlapi interface of Ontop, put the following in your pom.xml:

<dependency>
	<groupId>it.unibz.inf.ontop</groupId>
	<artifactId>ontop-quest-owlapi3</artifactId>
	<version>1.12.0</version>
</dependency>

If you want to use the sesame API interface of Ontop, use the following:

<dependency>
	<groupId>it.unibz.inf.ontop</groupId>
	<artifactId>ontop-quest-sesame</artifactId>
	<version>1.12.0</version>
</dependency>

If you need to use Ontop with R2RML, put the following dependency

<dependency>
  <groupId>it.unibz.inf.ontop</groupId>
  <artifactId>ontop-obdalib-r2rml</artifactId>
  <version>1.12.0</version>
</dependency>

and add the bolzano maven repo to your pom.xml

	<repositories>	
		<repository>
			<!-- for R2RML api -->
			<id>bolzano-nexus-public</id>
			<url>http://obdavm.inf.unibz.it:8080/nexus/content/groups/public/</url>
			<releases>
				<enabled>true</enabled>
			</releases>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
	</repositories>

For a complete example, please visit https://github.com/ontop/ontop-api-examples .