On Sat, Jun 16, 2018 at 2:37 AM, Michael Kuhn <mik@adminkuhn.ch> wrote:
Dewey Decimal Classification uses characters that indeed do look like Arabic numbers (standing for classes, divisions, sections), but these characters do not behave like numbers, so the correct sorting is actually not as you would expect (namely seen from the right to left)
1 2 11 21 100 230
but (and thus seen from left to right)
1 100 11 2 21 230
Hope this helps.
That's' not the way I understand it. The Dewey classes:
000 – Computer science, information & general works 100 – Philosophy and psychology 200 – Religion 300 – Social sciences 400 – Language 500 – Pure Science 600 – Technology 700 – Arts & recreation 800 – Literature 900 – History & geography 000 is sub-divided into the hundreds group 000 Computer science, knowledge & systems 010 Bibliographies 020 Library & information sciences 030 Encyclopedias & books of facts 040 [Unassigned] 050 Magazines, journals & serials 060 Associations, organizations & museums 070 News media, journalism & publishing 080 Quotations 090 Manuscripts & rare books and then sub-divided again into the thousands groups... 000 Computer science, information & general works 001 Knowledge 002 The book 003 Systems 004 Data processing & computer science 005 Computer programming, programs & data 006 Special computer methods 007 [Unassigned] 008 [Unassigned] 009 [Unassigned] ...and then sub-divisions of the thousands are done after the decimal point -- 001.1, 001.2, etc... as such, I don't think that callnumber 1.1 is a valid DDC number... it lacks the class and hundred-level group, and should, for the purposes of cn_sort, be converted to 001_100000000000000. (Numbers above are taken from https://www.oclc.org/content/dam/oclc/dewey/DDC%2023_Summaries.pdf).