There are two different archives included in this directory:

1.) parse_blast_xml.tar.gz is an example program to parse BLAST XML output
using Expat.  The expat libraries are required for this.  
README.parse_blast_xml is the README for this archive and is included
in the archive.

2.) blast_demo.tar.gz is an archive containing some example programs
to call the BLAST libraries (inside the NCBI toolkit).  The NCBI
toolkit is required for this.  README.blast_demo is a README
file that accompanies this archive and is included in the archive.