class FrameworkAgreement:
    """
    #### A class representing a conceptual framework agreement between parties.
    Attributes:
    - parties (list[str]): A list of parties involved in the framework agreement.
    - purpose (str): The purpose of the framework agreement.
    - terms (str): The basic terms and principles of the framework agreement.
    
    Methods:
    - establish_framework(): Establish the framework for the agreement between parties.
    - define_principles(terms: str): Define the principles for future transactions.

    """
    def __init__(self, parties=None, purpose=None, terms=None):
        self.parties = parties if parties is not None else []
        self.purpose = purpose if purpose is not None else ""
        self.terms = terms if terms is not None else ""
    
    def establish_framework(self):
        """
        Establish the framework for the agreement between company_a and company_b.
        """
        pass
    
    def define_principles(self):
        """
        Define the principles for future transactions.

        Args:
        terms (str): The basic terms and principles to be defined.
        """
        pass