4 - String: format operator % like in python
5 - String: assign fstream objects to read and write a file
6 - String: convert to and from std::sstream
8 - SuperString: sort and uniq
9 - SuperString: find (regex)
10 - SuperString: remove empty elements or elements macthing a pattern
12 - date: test parser for invalid dates and syntax errors
13 - date: Parser for stream input
14 - date: Yearday, Weekday and week number
16 - UTC: Convert to and from struct tm
18 - xml: Xinclude processing
20 - configuraion: Handle environment variables to override parameters