I need a program to manipulate library classification numbers, such as the Dewey-decimal classification system. Under such a classification system, an area of knowledge is subdivided into a hierarchy of sub-areas, sub-sub-areas and so on. Each little field is given a code, such that the code of a parent field is a prefix of the codes of the sub-fields within that field. For example, here is a (hypothetical) hierarchy of classifications and codes:
Code Classification
0 Science
01 Physics
02 Computing
020 Computer hardware
021 Computer languages
0210 Imperative languages
0211 Functional languages
02110 Haskell
02111 ML
02112 Scala
022 Artificial Intelligence
03 Mathematics
1 Arts
2 Religion
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