code: public static Collection<CollisionCategory> imports(Configurer configurer, MapTileCollision map)
      {
          Check.notNull(configurer);
          Check.notNull(map);
  
          final Collection<Xml> children = configurer.getRoot().getChildren(NODE_CATEGORY);
          final Collection<CollisionCategory> categories = new ArrayList<>(children.size());
  
          for (final Xml node : children)
          {
              final CollisionCategory category = imports(node, map);
              categories.add(category);
          }
  
          return categories;
      }
docs: Create the categories data from nodes.
  
  @param configurer The configurer reference (must not be <code>null</code>).
  @param map The map reference (must not be <code>null</code>).
  @return The category collisions data.
  @throws LionEngineException If unable to read node.