The abstract describes what the application profile is about. It should contain a problem definition, the standards described by the application profile and the goal of the application profile.
The namespace info:eu-repo is registered at http://info-uri.info
This name space is an authoritive placeholder for semantic terms, controlled vocabularies and identifiers.
By using this namespace all the terms used have a "web presence". Therefore it is no longer an arbitrary string, but contains meaning. This utilisation makes it future-proof.