code: def findBinaryDataType(params):
      
      binaryDataType = None
      cvParam = None
      for param in params:
          if param[0] in binaryDataArrayTypes:
              binaryDataType = binaryDataArrayTypes[param[0]]
              cvParam = param
              break
      return binaryDataType, cvParam
docs: #TODO: docstring
      from: http://www.peptideatlas.org/tmp/mzML1.1.0.html#binaryDataArray
      a binaryDataArray "MUST supply a *child* term of MS:1000518
      (binary data type) only once"
  
      :param params: #TODO: docstring
  
      :returns: #TODO: docstring