/usr/share/perl5/Mail/Message/Head/Subset.pod is in libmail-box-perl 2.110-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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=head1 NAME
Mail::Message::Head::Subset - subset of header information of a message
=head1 INHERITANCE
Mail::Message::Head::Subset realizes a Mail::Message::Head::Complete
Mail::Message::Head::Subset
is a Mail::Message::Head
is a Mail::Reporter
=head1 SYNOPSIS
my $subset = Mail::Message::Head::Subset->new(...)
$subset->isa('Mail::Message::Head') # true
$subset->guessBodySize # integer or undef
$subset->isDelayed # true
=head1 DESCRIPTION
Some types of folders contain an index file which lists a few lines of
information per messages. Especially when it is costly to read header lines,
the index speeds-up access considerably. For instance, the subjects of
all messages are often wanted, but waiting for a thousand messages of the
folder to be read may imply a thousand network reads (IMAP) or file
openings (MH)
When you access header fields which are not in the header subset, the whole
header has to be parsed (which may consume considerable time, depending on
the type of folder).
See L<documentation in the base class|Mail::Message::Head/"DESCRIPTION">.
=head1 OVERLOADED
See L<documentation in the base class|Mail::Message::Head/"OVERLOADED">.
=over 4
=item overload: B<"">()
See L<Mail::Message::Head/"OVERLOADED">
=item overload: B<bool>()
See L<Mail::Message::Head/"OVERLOADED">
=back
=head1 METHODS
See L<documentation in the base class|Mail::Message::Head/"METHODS">.
=head2 Constructors
See L<documentation in the base class|Mail::Message::Head/"Constructors">.
=over 4
=item Mail::Message::Head::Subset-E<gt>B<build>([PAIR|FIELD]-LIST)
See L<Mail::Message::Head/"Constructors">
=item Mail::Message::Head::Subset-E<gt>B<new>(OPTIONS)
See L<Mail::Message::Head/"Constructors">
=back
=head2 The header
See L<documentation in the base class|Mail::Message::Head/"The header">.
=over 4
=item $obj-E<gt>B<isDelayed>()
See L<Mail::Message::Head/"The header">
=item $obj-E<gt>B<isEmpty>()
See L<Mail::Message::Head/"The header">
=item $obj-E<gt>B<isModified>()
See L<Mail::Message::Head/"The header">
=item $obj-E<gt>B<knownNames>()
See L<Mail::Message::Head/"The header">
=item $obj-E<gt>B<message>([MESSAGE])
See L<Mail::Message::Head/"The header">
=item $obj-E<gt>B<modified>([BOOLEAN])
See L<Mail::Message::Head/"The header">
=item $obj-E<gt>B<orderedFields>()
See L<Mail::Message::Head/"The header">
=back
=head2 Access to the header
See L<documentation in the base class|Mail::Message::Head/"Access to the header">.
=over 4
=item $obj-E<gt>B<count>(NAME)
Count the number of fields with this NAME. If the NAME cannot be found,
the full header get loaded. In case we find any NAME field, it is
decided we know all of them, and loading is not needed.
=item $obj-E<gt>B<get>(NAME [,INDEX])
Get the data which is related to the field with the NAME. The case of the
characters in NAME does not matter. When a NAME is used which is not known
yet, realization will take place.
=item $obj-E<gt>B<study>(NAME [,INDEX])
See L<Mail::Message::Head/"Access to the header">
=back
=head2 About the body
See L<documentation in the base class|Mail::Message::Head/"About the body">.
=over 4
=item $obj-E<gt>B<guessBodySize>()
The body size is defined in the C<Content-Length> field. However, this
field may not be known. In that case, a guess is made based on the known
C<Lines> field. When also that field is not known yet, C<undef> is returned.
=item $obj-E<gt>B<isMultipart>()
See L<Mail::Message::Head/"About the body">
=back
=head2 Internals
See L<documentation in the base class|Mail::Message::Head/"Internals">.
=over 4
=item $obj-E<gt>B<addNoRealize>(FIELD)
See L<Mail::Message::Head/"Internals">
=item $obj-E<gt>B<addOrderedFields>(FIELDS)
See L<Mail::Message::Head/"Internals">
=item $obj-E<gt>B<fileLocation>()
See L<Mail::Message::Head/"Internals">
=item $obj-E<gt>B<load>()
See L<Mail::Message::Head/"Internals">
=item $obj-E<gt>B<moveLocation>(DISTANCE)
See L<Mail::Message::Head/"Internals">
=item $obj-E<gt>B<read>(PARSER)
See L<Mail::Message::Head/"Internals">
=item $obj-E<gt>B<setNoRealize>(FIELD)
See L<Mail::Message::Head/"Internals">
=back
=head2 Error handling
See L<documentation in the base class|Mail::Message::Head/"Error handling">.
=over 4
=item $obj-E<gt>B<AUTOLOAD>()
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<addReport>(OBJECT)
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<defaultTrace>([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])
=item Mail::Message::Head::Subset-E<gt>B<defaultTrace>([LEVEL]|[LOGLEVEL, TRACELEVEL]|[LEVEL, CALLBACK])
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<errors>()
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<log>([LEVEL [,STRINGS]])
=item Mail::Message::Head::Subset-E<gt>B<log>([LEVEL [,STRINGS]])
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<logPriority>(LEVEL)
=item Mail::Message::Head::Subset-E<gt>B<logPriority>(LEVEL)
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<logSettings>()
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<notImplemented>()
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<report>([LEVEL])
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<reportAll>([LEVEL])
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<trace>([LEVEL])
See L<Mail::Reporter/"Error handling">
=item $obj-E<gt>B<warnings>()
See L<Mail::Reporter/"Error handling">
=back
=head2 Cleanup
See L<documentation in the base class|Mail::Message::Head/"Cleanup">.
=over 4
=item $obj-E<gt>B<DESTROY>()
See L<Mail::Reporter/"Cleanup">
=back
=head1 DETAILS
See L<documentation in the base class|Mail::Message::Head/"DETAILS">.
=head1 DIAGNOSTICS
=over 4
=item Error: Package $package does not implement $method.
Fatal error: the specific package (or one of its superclasses) does not
implement this method where it should. This message means that some other
related classes do implement this method however the class at hand does
not. Probably you should investigate this and probably inform the author
of the package.
=back
=head1 SEE ALSO
This module is part of Mail-Box distribution version 2.110,
built on January 05, 2014. Website: F<http://perl.overmeer.net/mailbox/>
=head1 LICENSE
Copyrights 2001-2014 by [Mark Overmeer]. For other contributors see ChangeLog.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://www.perl.com/perl/misc/Artistic.html>
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