input: 
  def search_kb_sru(query: str, collection: str, start_record: int = 1, maximum_records: int = 1, record_schema: str = None) -> response:
      """
      Perform a search using the KB SRU API and return a response object containing the search results.
      
      Example:
      >>> search_kb_sru('digital libraries', 'GGC', start_record=1, maximum_records=5)
      <response object>
      
      >>> search_kb_sru('19th century', 'DPO')
      <response object>
      """
      sru_instance = sru()
      return sru_instance.search(query, collection, start_record, maximum_records, record_schema)
  
output:     sru_instance = sru()
      return sru_instance.search(query, collection, start_record, maximum_records, record_schema)