private void addEntry(final String group, final Object obj, final String title, final String description,
                          final Supplier<?> maker) {
        if (!entries.containsKey(group))
            entries.put(group, new ArrayList<>());

        entries.get(group).add(new Entry(title, obj, description, maker));
    }
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