Patrick, David Montag created a versioned graph approach on github: https://github.com/dmontag/neo4j-versioning
Perhaps you can take some inspiration from that. Otherwise: Books and Elements are nodes, effects would be relationships which have a timestamp (probably indexed). The relationship between book - [:CONTAINS]-> element would have a validity time-span. (It is started and open-ended when the element is added and closed when the element is removed. The you could traverse any book along its CONTAINS relationships while taking the time-span property into account for a concrete timestamp. You might choose to add the effect information as additional relationships between books and elements but perhaps it is enough to add those to appropriate properties of the CONTAINS relationship. Are there other effects as well? Is it possible to change the content of an element? (that would complicate the matter) Otherwise if that is realized as remove the old element and add the new one this would suffice. Addtionally it could be interesting to have links between related elements (either structural links - part -> chapter -> section -> paragraph | image | figure | table) or historical, i.e. link elements that replace other to those. HTH Michael Am 14.06.2011 um 21:14 schrieb Patrik Sundberg: > I should probably put in some estimates of the sort of orders of magnitude > of data involved: > Books are in the 100s > Effects are in the 10,000s / day > Elements are in the 100s / Book > > On Tue, Jun 14, 2011 at 8:07 PM, Patrik Sundberg > <[email protected]>wrote: > >> Hi, >> >> Design question: >> I have a Book. A book has Elements. To change what Elements are in a Book >> there are Effects. An Effect adds or deletes an element from a Book (and has >> other info). Everyday I archive the state of a Book so that I can easily get >> the state of the Book (it's Elements) at a historical point in time. The >> number of elements and which elements are in a Book vary from day to day >> depending on the Effects taking place in the time period. >> >> So it's a bit like "Book contents archive of day X + 1 = Book contents >> archive of day X + the Effects between X and X + 1" >> >> There's no need to represent the daily archives in any way, it's the >> functionality of having historical snapshots that matter to me, so that one >> can easily get the state of a Book at any point in time by finding the >> closest archive point before the time and applying the Effects from that >> archive timestamp and the point of interest. >> >> Ideally want to keep a long time history of Book state and Effects. >> >> Any ideas for an effecient of organizing this in a graph friendly way? >> >> Thanks, >> Patrik >> >> > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
