As can be seen in the Boron release versions here:
https://github.com/opendaylight/mdsal/blob/release/boron/model/ietf/ietf-inet-types-2013-07-15/pom.xml#L14
https://github.com/opendaylight/mdsal/blob/release/boron/model/ietf/ietf-yang-types-20130715/pom.xml#L21

The artifactIds are inconsistent (one has the date as a single number suffix and the other has it with dashes) and the versions are inconsistent, with one being the revision date and the other being 1.1.0.

At best this is confusing to new users. At worst this is likely bugs waiting to happen.