start with an identifier in column 1 and extend up to the next non-blank in column 1 This can be the identifier to the next chapter. Chapter names are case-sensitive.
#this line starts the uncompiled appendix section
chapter1
All lines up to the next non-blank in column1
belong to this appendix item.
A=3.1 B=1/9, TXT=hello world, VEC=4.1 -5 6.2
end of chapter 1 (= start of the chapter called "end")