vhistory – Support for creating a change log

Vhis­tory sim­pli­fies the cre­ation of a his­tory of ver­sions of a doc­u­ment. You can eas­ily ex­tract in­for­ma­tion like the cur­rent ver­sion of a list of au­thors from that his­tory. It helps you to get con­sis­tent doc­u­ments.
The pack­age sets, which is used by vhis­tory, al­lows you to use sets con­tain­ing text. You can use the usual op­er­a­tions to cre­ate the union of sets or the in­ter­sec­tion of sets etc.