droolsjbpm/guvnor — comment on commit 9b3ada6ba3f2b1b43083a191a18f397c67b10e5c
File: guvnor-webapp/pom.xml line 354
By ge0ffrey:

from maven docs:

Dependency Management

Besides inheriting certain top-level elements, parents have elements to configure values for child POMs and transitive dependencies. One of those elements is dependencyManagement.

* dependencyManagement: is used by POMs to help manage dependency information across all of its children. If the my-parent project uses dependencyManagement to define a dependency on junit:junit:4.0, then POMs inheriting from this one can set their dependency giving the groupId=junit and artifactId=junit only, then Maven will fill in the version set by the parent. The benefits of this method are obvious. Dependency details can be set in one central location, which will propagate to all inheriting POMs. In addition, the version and scope of artifacts which are incorporated from transitive dependencies may also be controlled by specifying them in a dependency management section.