class_docstr: Base object for expressions.
  
  Expressions must implement the expr property.
docstr: Get the expression structure for workflow service calls.
docstr_tok: ["Get","the","expression","structure","for","workflow","service","calls","."]
code: def expr(self) -> RequestType:
      """Get the expression structure for workflow service calls."""
  
imports: from __future__ import absolute_import
  import abc
  from enum import EnumMeta
  from typing import Any, Dict, List, Union, TYPE_CHECKING
label_desc: Use image node_id 1 for calling the Expression obj's underlying member method code with example usage: obj.expr() without return types