hdblp: historical data of the dblp collection

<p>This data set contains historical data of the dblp collection (https://dblp.org). I.e., for each metadata record, the collection contains all known revisions that existed in dblp.&nbsp;</p> <p>With hdblp, the state of dblp can be restored for each day between June 2 1999 and December 17 2018. hdblp can be used to study the development of the dblp collection.</p> <p>Correction of version 2 which omitted the data set description.&nbsp;</p>