code: public static Collection<TileGroup> imports(Media groupsConfig)
      {
          Check.notNull(groupsConfig);
  
          final Xml nodeGroups = new Xml(groupsConfig);
  
          final Collection<Xml> children = nodeGroups.getChildren(NODE_GROUP);
          final Collection<TileGroup> groups = new ArrayList<>(children.size());
  
          for (final Xml nodeGroup : children)
          {
              final TileGroup group = importGroup(nodeGroup);
              groups.add(group);
          }
  
          return groups;
      }
docs: Import the group data from configuration.
  
  @param groupsConfig The groups descriptor (must not be <code>null</code>).
  @return The groups data.
  @throws LionEngineException If unable to read data.