Here is a list of all documented files with brief descriptions:

include
rpm
argv.h
header.h
rpmarchive.h
rpmbase64.h
rpmbuild.h
rpmcallback.h
rpmcli.h
rpmcrypto.h
rpmdb.h
rpmds.h
rpmfc.h
rpmfi.h
rpmfiles.h
rpmfileutil.h
rpmio.h
rpmkeyring.h
rpmlib.h
rpmlog.h
rpmmacro.h
rpmpgp.h
rpmplugin.h
rpmprob.h
rpmps.h
rpmsign.h
rpmspec.h
rpmsq.h
rpmstring.h
rpmstrpool.h
rpmsw.h
rpmtag.h
rpmtd.h
rpmte.h
rpmts.h
rpmtypes.h
rpmurl.h
rpmutil.h
rpmver.h
librpm
Doxyheader.h