input: 
  from typing import List, Optional
  
  class sru:
      def search(self, query: str, collection: Optional[str] = None, startrecord: int = 1, maximumrecords: int = 1, recordschema: Optional[str] = None) -> Optional[response]:
          """
          Searches the KB SRU API with the given query and optional parameters.
          Returns a 'response' object containing the search results, or False if no results are found.
          
          Example:
          s = sru()
          resp = s.search("keywords", collection="ANP", startrecord=1, maximumrecords=10, recordschema="dcx")
          if resp:
              print(resp.titles)
          
          Output:
          ["Title 1", "Title 2"]
          """
          pass
  
output:     
          import requests
          from xml.etree import ElementTree as ET
  
          base_url = "http://www.example.com/sru"
          params = {
              "query": query,
              "startRecord": startrecord,
              "maximumRecords": maximumrecords,
          }
          if collection:
              params["collection"] = collection
          if recordschema:
              params["recordSchema"] = recordschema
  
          response = requests.get(base_url, params=params)
          if response.status_code != 200:
              return None
  
          root = ET.fromstring(response.content)
          records = root.findall(".//{http://www.loc.gov/zing/srw/}record")
          if not records:
              return None
  
          class response:
              def __init__(self, titles):
                  self.titles = titles
  
          titles = [record.find(".//{http://purl.org/dc/elements/1.1/}title").text for record in records]
          return response(titles)
  