value=

Sets the contents of this text node. This expects the text to be unnormalized. It returns self.

  e = Element.new( "a" )
  e.add_text( "foo" )   # <a>foo</a>
  e[0].value = "bar"    # <a>bar</a>
  e[0].value = "<a>"    # <a>&lt;a&gt;</a>