Köchel catalogue son's earlier works; Mozart's catalogue of his own compositions (begun in February 1784 with K. 449) allows relatively precise dating of many of his later works. The catalogue included the opening bars of each piece, known as an incipit. Köchel divided the corpus into a main chronology of 626 works, and five appendices ("" in German, abbreviated to "Anh.") The appendices (Anh. I-V) included: Since Köchel published his original catalogue in 1863 (now referred to as K), the dating of Mozart's compositions has been subject to constant revision. Many more pieces have since been found, re-dated, re-attributed and re-numbered, requiring
Austrian National Library also successfully introduced the card index. This facilitated the continuous updating of the inventory. After the Holy Roman Empire was dissolved by Napoleon and the Austrian Empire proclaimed in its place, the library was again reorganized. Under custodian Paul Strattmann, the library received a program for the first time which described its order; the library gained a three-way viewpoint: The collection politics of the Imperial Library separated at the beginning the 19th century appreciably due to the requirements of the representation and its attention to scientific works. The multinational condition of the Austrian Empire brought with itself that, not only