ABNF
====

The build process now uses BAP, Bill Fenner's ABNF parser.

To build BAP:

cd ~/abnfparser/bap
./configure
make

If linking fails, try to change 

  bap:    ${OBJS}
          ${CC} -o $@ ${DEBUG} ${OBJS} -ll
        
to

  bap:    ${OBJS}
          ${CC} -o $@ ${DEBUG} ${OBJS} -lfl
          

The actual build process does the following steps:

1) Extract ABNF

Extracts the individual ABNF fragments (labeled with type="abnf2616") into
*.abnf (using XSLT).

2) Parse ABNF and do 1st formatting step

Parse the ABNF using BAP, sort it, and re-parse the result using BAP,
serializing the result with folded lines for RFC production to *.parsed-abnf.

3) Generate Collected ABNF appendix, and check whether the src is up2date

Reads both *.xml and *parsed-abnf using XSLT, generating *.abnf-appendix,
ready for inclusion into the source. While doing so, checks that the current
source has an up to date appendix already.

This step will produce a WARNING message when the newly generated appendix
needs to be refreshed in the source.

Q: Why not do it automatically?

A: Mainly, it would make bootstrapping harder, given the current toolchain.