input: Write a function to create an instance of the "sru" class and use its "search" method to perform a query, specifying the collection name, start record number, maximum number of records to return, and record schema. The function should return the "response" object and allow access to specific information from the search results.
  
  `def perform_sru_search(query, collection="GGC", startrecord=1, maximumrecords=1, recordschema=False):`
  
  assert isinstance(perform_sru_search("test query").records, record)
  assert perform_sru_search("another query", collection="DPO").titles != []
  assert perform_sru_search("subject query", collection="ANP").subjectsBrinkman == []
  assert perform_sru_search("empty query", maximumrecords=0) == False
output: 
      sru_instance = sru()
      response = sru_instance.search(query, collection=collection, startrecord=startrecord, maximumrecords=maximumrecords, recordschema=recordschema)
      return response
  