code: public static final UUID parseUUID(String value)
     {
        UUID result = null;
        if (value != null && !value.isEmpty())
        {
           if (value.charAt(0) == '{')
           {
              // PMXML representation: <GUID>{0AB9133E-A09A-9648-B98A-B2384894AC44}</GUID>
              result = UUID.fromString(value.substring(1, value.length() - 1));
           }
           else
           {
              // XER representation: CrkTPqCalki5irI4SJSsRA
              byte[] data = javax.xml.bind.DatatypeConverter.parseBase64Binary(value + "==");
              long msb = 0;
              long lsb = 0;
  
              for (int i = 0; i < 8; i++)
              {
                 msb = (msb << 8) | (data[i] & 0xff);
              }
  
              for (int i = 8; i < 16; i++)
              {
                 lsb = (lsb << 8) | (data[i] & 0xff);
              }
  
              result = new UUID(msb, lsb);
           }
        }
        return result;
     }
docs: Convert the Primavera string representation of a UUID into a Java UUID instance.
  
  @param value Primavera UUID
  @return Java UUID instance