code: def state_create_is_valid( nameop ):
      
      assert '__state_create__' in nameop, "Not tagged with @state_create"
      assert nameop['__state_create__'], "BUG: tagged False by @state_create"
      assert '__preorder__' in nameop, "No preorder"
      assert '__table__' in nameop, "No table given"
      assert '__history_id_key__' in nameop, "No history ID key given"
      assert nameop['__history_id_key__'] in nameop, "No history ID given"
      assert '__always_set__' in nameop, "No always-set fields given"
  
      return True
docs: Is a nameop a valid state-preorder operation?