This dataset contains an analysis of DDC notations in K10plus union catalogue (as of 2023-12-31). Distinct DDC numbers found in K10plus: 700.717 Fully decomposed: 473.161 (67%) Distinct atomic elements: 32.154 Sources The data is based on: Normalized subject indexing data of K10plus library union catalog Decomposition of DDC numbers (coli-ana) The dataset consists of: ddc-frequencies.tsv: sorted DDC notations found in K10plus records, each with number of records it is used in (tsv format) ddc-decomposition.ndjson.gz: full analysis of DDC notations in newline-delimited JSKOS (including incomplete analysis and non-atomic elements) (jskos format) ddc-decomposition.csv: atomic DDC elements from decomposition. First column is original number, following columns are atomic elements (csv format) ddc-atoms.tsv: atomic DDC numbers found in fully decomposed numbers of K10plus catalogue (tsv format)With the following fields: atom: atomic DDC number which cannot be decomposed further number: number of distinct DDC numbers this atom is used in records: number of K10plus records this atom is used in Contributors Verbundzentrale des GBV (VZG) Jakob Voß Ulrike Reiner