text: from dataclasses import dataclass, field
  from typing import Optional
  from xsdata.models.datatype import XmlPeriod
  
  __NAMESPACE__ = "NISTSchema-SV-IV-atomic-gYear-maxExclusive-1-NS"
  
  
  @dataclass
  class NistschemaSvIvAtomicGYearMaxExclusive1:
      class Meta:
          name = "NISTSchema-SV-IV-atomic-gYear-maxExclusive-1"
          namespace = "NISTSchema-SV-IV-atomic-gYear-maxExclusive-1-NS"
  
      value: Optional[XmlPeriod] = field(
          default=None,
          metadata={
              "required": True,
              "max_exclusive": XmlPeriod("1971"),
          }
      )
  