Tag editing

For most users, there is no change.  If you set the permission level to modify tags, then problem pages and library brower 1 get drop down menus showing the current tags of the problem (if it has them) for subject/chapter/section.  There is also a save button, which works if the web server has write permission for the file.

Tags are filled based on the content of the problem.  This can be used for OPL maintainers to change tags, and for people getting sets of problems ready for inclusion in the OPL.