class Nokogiri::XML::Node

def <<(node_or_tags)

Also see related method +add_child+.

Returns +self+, to support chaining of calls (e.g., root << child1 << child2)

containing markup.
+node_or_tags+ can be a Nokogiri::XML::Node, a ::DocumentFragment, a ::NodeSet, or a String

Add +node_or_tags+ as a child of this Node.
## 
def <<(node_or_tags)
  add_child(node_or_tags)
  self
end