class_docstr: A base class for Bokeh properties with simple get/set and serialization
  behavior.
class_docstr_tok: ["A","base","class","for","Bokeh","properties","with","simple","get\/set","and","serialization","behavior","."]
docstr: Whether the property can refer to another ``HasProps`` instance.
  
  For basic properties, delegate to the ``has_ref`` attribute on the
  |Property|.
code: def has_ref(self) -> bool:
      """Whether the property can refer to another ``HasProps`` instance.
  
      For basic properties, delegate to the ``has_ref`` attribute on the
      |Property|.
  
      """
      return self.property.has_ref
  
imports: from __future__ import annotations
  import logging
  from copy import copy
  from types import FunctionType
  from typing import TYPE_CHECKING, Any, Callable, Generic, TypeVar
  from ...util.deprecation import deprecated
  from .singletons import Undefined
  from .wrappers import PropertyValueColumnData, PropertyValueContainer
label_desc: Use image node_id 11 for calling the PropertyDescriptor obj's underlying member method code with example usage: obj.has_ref() and returns: self