code: def concat_dim(cls, datasets, dim, vdims):
      import xarray as xr
  
      return xr.concat(
          [
              ds.assign_coords(**{dim.name: c})
              for c, ds in datasets.items()
          ],
          dim=dim.name,
      )
  
imports: import sys
  import types
  import numpy
  import pandas
  from ..None import util
  from ..dimension import Dimension, asdim, dimension_name
  from ..element import Element
  from ..ndmapping import NdMapping, item_check, sorted_context
  from .grid import GridInterface
  from .interface import DataError, Interface
  from .util import dask_array_module, finite_range
label_desc: Use image node_id 18 for calling the XArrayInterface obj's underlying member method code with example usage: obj.concat_dim(cls, datasets, dim, vdims) and returns: xr