code: public UNode addArrayNode(String name, String tagName) {
          return addChildNode(UNode.createArrayNode(name, tagName));
      }
docs: Create a new ARRAY node with the given name and tag name and add it as a child of
  this node. This node must be a MAP or ARRAY. This is a convenience method that
  calls {@link UNode#createArrayNode(String, String)} and then
  {@link #addChildNode(UNode)}.
  
  @param  name     Name of new ARRAY node.
  @param  tagName  Tag name of new ARRAY node (for XML).
  @return          New ARRAY node, added as a child of this node.