code: public void setX(float v) {
      if (DocumentElement_Type.featOkTst && ((DocumentElement_Type)jcasType).casFeat_x == null)
        jcasType.jcas.throwFeatMissing("x", "ch.epfl.bbp.uima.types.DocumentElement");
      jcasType.ll_cas.ll_setFloatValue(addr, ((DocumentElement_Type)jcasType).casFeatCode_x, v);}
docs: setter for x - sets
  @generated
  @param v value to set into the feature