new_contents: import os
  from robofab.ufoLib import UFOReader
  
  # ----------------
  # Public Functions
  # ----------------
  
  def isUFO(pathOrFile):
      if not isinstance(pathOrFile, basestring):
          return False
      if os.path.splitext(pathOrFile)[-1].lower() != ".ufo":
          return False
      if not os.path.isdir(pathOrFile):
          return False
      try:
          reader = UFOReader(pathOrFile)
      except:
          return False
      return True
  
  def extractFontFromUFO(pathOrFile, destination, doGlyphs=True, doInfo=True, doKerning=True, doGroups=True, doFeatures=True, doLib=True, customFunctions=[]):
      source = UFOReader(pathOrFile)
      if doInfo:
          source.readInfo(destination.info)
      if doKerning:
          kerning = source.readKerning()
          destination.kerning.update(kerning)
      if doGroups:
          groups = source.readGroups()
          destination.groups.update(groups)
      if doFeatures:
          features = source.readFeatures()
          destination.features.text = features
      if doLib:
          lib = source.readLib()
          destination.lib.update(lib)
      if doGlyphs:
          glyphSet = source.getGlyphSet()
          for glyphName in glyphSet.keys():
              destination.newGlyph(glyphName)
              glyph = destination[glyphName]
              pointPen = glyph.getPointPen()
              glyphSet.readGlyph(glyphName=glyphName, glyphObject=glyph, pointPen=pointPen)
      for function in customFunctions:
          function(source, destination)
  
subject: Add support for extracting a UFO from a UFO. It sounds silly, but it is useful.