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Why Colon Classification has not been updated so long time?

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No one libaray use of CC becz its use to difficult, and classify of book...DDC and UDC is is very easy to use and classify of books...becz DDC hv  alredy No.and its very easy to acess to user ......its my poin of view....so dat is the reason cc is not updated...

but it is difficult for a rural library to buy a DDC

Yes, manually  DDC is easier to use than CC.so most of the library use DDC. But during research it is found that DDC is difficult for automatic classification system. while we are going  for automated classification, DDC creates a lot of problems. Researcher find CC is comfortable for auto-classification.Now the research is going on for  CC based automated classification system.

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