A description of the +* files for each package, whcih are stored in
${PKG_DBDIR}/<package-name>/:

+BUILD_INFO - information on definitions and program versions used to
compile the package.  Generated automatically at package install time.

+BUILD_VERSION - the NetBSD RCS Ids of all files used to control the
building of the package.  Generated automatically at package install
time.

+COMMENT - a one-line description of the package, currently taken from
the pkg/COMMENT file at installation time

+CONTENTS - the inventory of files, directories and other filesystem
entries which make up a package.  Each file has a checksum, which is
used to determine, at the time of package deletion, if the file has
been modified in any way.  This file also includes fields for
prefices, any pre-requisite packages, any conflicting packages,
package names, etc.  This file is generated by pkg_create(1) at
installation time, using the pkg/PLIST file as a base.

+DESC - a fuller description of the package, currently generated using
the pkg/DESCR file at installation time (the HOMEPAGE definition is
added for example)

+REQUIRED_BY - a list of all the installed packages which require this
package to be installed. Generated when a package is installed which
lists this one as a DEPENDS.

+SIZE_ALL - the number of bytes of space of the package, and all its
pre-requisite packages. Generated automatically at installation time.

+SIZE_PKG - the number of bytes of space needed to install this
package. Generated automatically at installation time.

Regards,
Alistair