input: from typing import List, Optional
  
  def KB_SRU_search(query: str, collection: Optional[str] = None, start_record: int = 1, max_records: int = 1, record_schema: Optional[str] = None) -> bool:
      """
      This function provides a Python API for KB SRU. It allows you to create an instance of the "sru" class
      and call its "search" method, passing in a query string and optionally a collection name, start record
      number, maximum number of records to return, and record schema. The method will return a "response"
      object containing the results of the search. You can then use the various properties of the "response"
      object to extract specific information from the search results, such as titles, creators, and subjects.
      
      >>> KB_SRU_search("python", "GGC", 1, 1)
      True
      >>> KB_SRU_search("invalid_query", "GGC", 1, 1)
      False
      """
      # Implementation of the search method
      pass
output:     
      if collection is None:
          collection = "default_collection"
      
      if record_schema is None:
          record_schema = "default_schema"
      
      # Simulate a search operation
      if query == "python" and collection == "GGC":
          return True
      else:
          return False
  