tags: #publish links: [[Library Classification Systems]], [[Obsidian Techniques]] created: 2020-10-16 Fri related: [[Using Universal Decimal Classification (UDC) or Broad System of Ordering (BSO) for tagging and classifying notes]] --- # Universal Decimal Classification (UDC) A generalisation of Dewey Decimal Classification (DDC) with the addition of facets etc. [Universal Decimal Classification - Wikipedia](https://en.wikipedia.org/wiki/Universal_Decimal_Classification) [UDC Summary](http://www.udcsummary.info/php/index.php) can be consumed without a license and is plenty comprehensive enough.