<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _is_declaration(self, name, value):
 """Determines if a class attribute is a field value declaration. Based on the name and value of the class attribute, return ``True`` if it looks like a declaration of a default field value, ``False`` if it is private (name starts with '_') or a classmethod or staticmethod. """

        if isinstance(value, (classmethod, staticmethod)):
            return False
        elif enums.get_builder_phase(value):
            # All objects with a defined 'builder phase' are declarations.
            return True
        return not name.startswith("_")