- Sort keys
- Normalization
- Diacritics (accents, etc.)
- Pre-combined v. combining forms
- Case folding
- Mixed language sorting
- Category display segmentation (head characters)
- Category TOCs
- Unicode collation algorithm
- Performant implementation (currently database-level sorts)
- How to allow different categories to define their own collations while using off-the-shelve, Open Source databases in a performant way?
- How to deal with huge categories if the collation is changed?
- //en.wiktionary.org/w/index.php?title=Special:Search&search=sorting&ns4=1&fulltext=Search
- //en.wiktionary.org/w/index.php?title=Special:Search&search=collation&ns4=1&fulltext=Search
- //en.wiktionary.org/w/index.php?title=Special:Search&search=Unicode&ns4=1&fulltext=Search