Version 0.21

• make \__xsim_set_file_signature:nnn public
• make \l__xsim_file_path_and_name_tl, \l__xsim_file_name_tl and \l__xsim_file_path_tl public
• introduce \XSIMsetfilebeginX and \XSIMsetfileendX (xsimverb)
• reduce comment line in automated comments in exercise and solution files
• add option <tag>/use-unmatched
• document option blank/fill
• add counter foreach type and collection that holds the number of exercises of a type in a collection
• fix issue #90
• correct file hooks (cf. issue #98)
• implement issue #88
• fix issue #96
• use! and print! had gone lost; add them back in.
• add new options match-all/match-any for the collection conditions; resolves issue #94.
• new \ForEachUsedExerciseByOrder, used in the table templates; resolves issue #85

Version 0.20

• switch to one sty file per package
• use LaTeX's new hooks
• declare undeclared variables
• new exercise setup mechanism which clearly determines the difference between definition,
  usage, and printing of an exercise; this also solves the problem with added goals in the
  exercise body in a collection
• re-write collection mechanism:
  • changes the behaviour of \collectexercises but doesn't require external files any more and more importantly doesn't require inputting files several times for multiple collections
  • drop \collectexercisestype
  • new \(de)activatecollection
  • new options collect and <type>/collect
• small improvements in performance
• new parameters within and the-counter
• make no-files the default, new option use-files
• new examples
• various small fixes

Version 0.19

• improve performance
• only set \ExerciseID and \ExerciseType locally to ensure correct values when exercises (of different types) are nested
• new load-time option debug (only for development – not documented)

Version 0.18

• fix printing of unused solutions (issue #56)
• enhance \printexercise and \printsolution to accept a csv list of either ids or IDs (or mixed)
• more templates in the layouts style

Version 0.17

• prefer lazy boolean evaluation if possible
• remove spurious \par at the beginning and end of typeset exercises
• add blank option, implements issue #31
• add solution property, implements issue #33
• fix issue #27
• implement issue #2: points in subquestions
• don't allow package options to be set with \xsimsetup

Version 0.16

• fix issue due to usage of own auxiliary file
• new commands \XSIMatbegindocument and \XSIMatenddocument (related to usage of own aux file)
• new commands \xprintexercise, \xprintsolution, \xsimprint, and \xsimxprint
• new example texsx-498299 (multiple choice questions and solutions)

Version 0.15

• use own auxiliary file (.xsim) per default
• new package option use-aux

Version 0.14

• new exercise parameters exercise-heading and solution-heading
• new options exercise/heading and solution/heading as interface for setting the new parameters
• new command \GetExerciseHeadingF for using the new parameters in environment templates
• change the environment template default to use the new \GetExerciseHeadingF and output a \par at the end
• make argument of \xsimsetup long
• new template minimal
• new option load-style
• new example texwelt-23968 (long and short solutions)

Version 0.13

New option no-files which disables the writing to external files and saves the exercises to the aux file instead.

Version 0.12

• add parameter versions for the plural forms of exercise and solution names
• bug fixes (issues #37, #39, #43, and #47)