code: def schema(self) -> pa.Schema:
      return self._schema
  
file_path: vegafusion/python/vegafusion/vegafusion/datasource/dfi_datasource.py
imports: from typing import Iterable
  import re
  import pyarrow
  from typing import Any, Dict
  from ._dfi_types import DtypeKind, DataFrame
  from .datasource import Datasource
label_desc: Use image node_id 2 for calling the DfiDatasource obj's underlying member method code with example usage: obj.schema() and returns: self