docs: def get_values(self):
          """
          Add Table to XMLBIF.
  
          Return
          ---------------
          dict: dict of type {variable: table tag}
  
          Examples
          -------
          >>> writer = XMLBIFWriter(model)
          >>> writer.get_values()
          {'dog-out': <Element TABLE at 0x7f240726f3c8>,
           'light-on': <Element TABLE at 0x7f240726f488>,
           'bowel-problem': <Element TABLE at 0x7f240726f388>,
           'family-out': <Element TABLE at 0x7f240726f408>,
           'hear-bark': <Element TABLE at 0x7f240726f448>}
          """
          cpds = self.model.get_cpds()
          definition_tag = self.definition
          table_tag = {}
          for cpd in cpds:
              table_tag[cpd.variable] = etree.SubElement(definition_tag[cpd.variable], "TABLE")
              table_tag[cpd.variable].text = ''
              for val in cpd.get_values().ravel(order="F"):
                  table_tag[cpd.variable].text += str(val) + ' '
  
          return table_tag