Include a xourse in a xourse

[wiobber]

It would be nice to be able to include a xourse inside another xourse (e.g. a list of exercises from an exerciseList (which is a xourse) could be added to (a specific version of ...) the theory-xourse)

[wiobber]

A preliminary version is on https://ximera.osu.edu/wimexamples/exerciseCollection/course

[wiobber]

Note on terminology:

• Ximera has two documentclasses, 'ximera' and 'xourse'
• Ximera uses three concepts:
  • 'activity' (corresponds to documentclass{ximera}, and maps to ONE webpage
  • 'xourse' (or 'activityList'): a list of activities, which are gathered together by an HTML menu, and result in one PDF. A xourse can ave different \part's, and (experimenatlly...) also include other xourses.
  • 'practice' (corresponds also to documentclass{ximera}, used for exercises/problems etc, only differs from an 'activity' in layout in the HTML-menu

Idea: introduce a documentclass 'practice' which would contain exactly ONE exercises (potentially with several sub-exercises ...), but have no title etc, and from which one can easily gather practiceLists (which could either all come on ONE html page or have a html page per practice ...). These 'practices' could alse be included in activities/ximera's... ? The list of 'practices' would become a kind of database of individually compilable exercises that could also easily be combined is sets/homeworks/...