from typing import Optional, List as typing_List, Dict as typing_Dict
from datetime import datetime

class Field:
    def __init__(self, description=None, examples=None, required=True, default=None, default_factory=None):
        self.description = description
        self.examples = examples or []
        self.required = required
        self.default = default
        self.default_factory = default_factory

class Model:
    @classmethod
    def validator(cls):
        # Implementation here
        pass
    
    @classmethod
    def schema(cls):
        # Implementation here
        pass
    
    @classmethod
    def parse(cls, data):
        # Implementation here
        pass

# Type aliases
List = typing_List
Dict = typing_Dict 