'tomcat:catalina-optional:5.5.9-alpha'
<dependency>
<groupId>tomcat</groupId>
<artifactId>catalina-optional</artifactId>
<version>5.5.9-alpha</version>
</dependency>
<dependency org="tomcat" name="catalina-optional" rev="5.5.9-alpha"/>
"tomcat", "catalina-optional", "5.5.9-alpha"