code: def extract_columns_from_table_definition_file(xmltag, table_definition_file):
      
      def handle_path(path):
          """Convert path from a path relative to table-definition file."""
          if not path or path.startswith("http://") or path.startswith("https://"):
              return path
          return os.path.join(os.path.dirname(table_definition_file), path)
  
      columns = list()
      for c in xmltag.findall('column'):
          scale_factor = c.get("scaleFactor")
          display_unit = c.get("displayUnit")
          source_unit = c.get("sourceUnit")
  
          new_column = Column(c.get("title"), c.text, c.get("numberOfDigits"),
                     handle_path(c.get("href")), None, display_unit, source_unit,
                     scale_factor, c.get("relevantForDiff"), c.get("displayTitle"))
          columns.append(new_column)
  
      return columns
docs: Extract all columns mentioned in the result tag of a table definition file.