/**
  * Adds a new CertID object
  *
  * @param cid new object to be added
  */
 public void addCertID(CertID cid) {
   m_unsignedProps.getSignature().addCertID(cid);
 }
 /**
  * return the count of CertID objects
  *
  * @return count of CertID objects
  */
 public int countCertIDs() {
   return m_unsignedProps.getSignature().countCertIDs();
 }
 /**
  * Retrieves CertID element with the desired type. If not found creates a new one with this type.
  *
  * @param type CertID type
  * @return CertID element
  * @throws DigiDocException for validation errors
  */
 public CertID getOrCreateCertIdOfType(int type) throws DigiDocException {
   return m_unsignedProps.getSignature().getOrCreateCertIdOfType(type);
 }
 /**
  * Retrieves CertID element with the desired type
  *
  * @param type CertID type
  * @return CertID element or null if not found
  */
 public CertID getCertIdOfType(int type) {
   return m_unsignedProps.getSignature().getCertIdOfType(type);
 }
 /**
  * Retrieves the last CertID element
  *
  * @return CertID element or null if not found
  */
 public CertID getLastCertId() {
   return m_unsignedProps.getSignature().getLastCertId();
 }
 /**
  * Retrieves CertID element with the desired index
  *
  * @param idx CertID index
  * @return CertID element or null if not found
  */
 public CertID getCertID(int idx) {
   return m_unsignedProps.getSignature().getCertID(idx);
 }