Maven dependencies loaded via ASDF defintions.
If a Maven3 installation can be found via FIND-MVN, ASDF definitions of the form (:mvn "GROUP-ID/ARTIFACT-ID" :version "VERSION") will be resolved at the ASDF system load time via the Maven Aether resolution mechanism. The log4j example wrapping now works. N.b. this code seriously distorts some of the notions of ASDF which really seems to depend on its components actually being resident on the filesystem. This needs to be adressed ("blessed") via consultation with ASDF developers to ensure that the path we are choosing is reasonably future-proof.
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