class_docstr: Class for Cifti2 header extension
class_docstr_tok: ["Class","for","Cifti2","header","extension"]
docstr: Return True if `intent_code` matches our class `klass`
docstr_tok: ["Return","True","if","`","intent_code","`","matches","our","class","`","klass","`"]
code: def _valid_intent_code(klass, intent_code):
      """Return True if `intent_code` matches our class `klass`"""
      return intent_code >= 3000 and intent_code < 3100
  
imports: from io import BytesIO
  import numpy
  from packaging.version import Version, parse
  from ..None import xmlutils
  from ..batteryrunners import Report
  from ..nifti1 import Nifti1Extension, extension_codes, intent_codes
  from ..nifti2 import Nifti2Header, Nifti2Image
  from ..spatialimages import HeaderDataError
  from .cifti2 import CIFTI_BRAIN_STRUCTURES, CIFTI_MODEL_TYPES, Cifti2BrainModel, Cifti2Header, Cifti2HeaderError, Cifti2Label, Cifti2LabelTable, Cifti2Matrix, Cifti2MatrixIndicesMap, Cifti2MetaData, Cifti2NamedMap, Cifti2Parcel, Cifti2Surface, Cifti2TransformationMatrixVoxelIndicesIJKtoXYZ, Cifti2VertexIndices, Cifti2Vertices, Cifti2Volume, Cifti2VoxelIndicesIJK, _underscore
label_desc: Use image node_id 1 for calling the _Cifti2AsNiftiHeader obj's underlying member method code with example usage: obj._valid_intent_code(klass, intent_code) and returns: unknown