public List<Entry> entries() {
        return Collections.unmodifiableList(entries.values().stream().flatMap(Collection::stream).collect(Collectors.toList()));
    }
Defines the supported types for IO and the versions (and configurations) to which they apply and are tested.

@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-util/src/test/java/org/apache/tinkerpop/gremlin/structure/io/Model.java