The following information was provided by the package's contributor.
Name of contribution: prerex Author's name: Bob Tennent Package version: 2014-05-21 Location on CTAN: graphics/prerex/ Summary description: Interactive editor and macro support for prerequisite charts License type: lppl
Announcement text given by the package's contributor:
prerex.sty has been simplified by removing support for html or svg links (because dvisvgm or pdf2svg are adequate for producing SVG charts for use on the web).
Announcement required: Yes
Users may view the package catalogue entry at http://www.ctan.org/pkg/prerex or they may browse the package directory at http://mirror.ctan.org/graphics/prerex/
thanks for the upload (my apologies for the late announcement); i've installed the new version, and updated the catalogue repository.
Robin Fairbairns
For the CTAN team