class_docstr: Mixin to create documents that conform to the load/save spec.
code: def abort(self):
      # What does it mean to "clear" a document?  Does the
      # documentElement disappear?
      raise NotImplementedError(
          "haven't figured out what this means yet"
      )
  
imports: import copy
  import xml.dom
  from xml.dom.NodeFilter import NodeFilter
label_desc: Use image node_id 3 for calling the DocumentLS obj's underlying member method code with example usage: obj.abort() without return types