public Builder structuralClassOID(String strucuralClassOID){
  this.structuralClassOID=strucuralClassOID;
  return this;
}

public Builder structuralClassOID ( String strucuralClassOID ) { this . structuralClassOID = strucuralClassOID ; return this ; }
sets the structural class oid which uniquely identifies this dit content rule .
