code: public void setDoi(String v) {
      if (Header_Type.featOkTst && ((Header_Type)jcasType).casFeat_doi == null)
        jcasType.jcas.throwFeatMissing("doi", "de.julielab.jules.types.Header");
      jcasType.ll_cas.ll_setStringValue(addr, ((Header_Type)jcasType).casFeatCode_doi, v);}
docs: setter for doi - sets document object identifier
  @generated
  @param v value to set into the feature