<groupId>org.opendaylight.mdsal.model</groupId>
<artifactId>ietf-topology</artifactId>
</dependency>
+ <dependency>
+ <groupId>org.opendaylight.mdsal.model</groupId>
+ <artifactId>yang-ext</artifactId>
+ </dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>