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.\" ========================================================================
.\"
.IX Title "Mail::SpamAssassin::Message::Metadata 3"
.TH Mail::SpamAssassin::Message::Metadata 3 "2015-04-29" "perl v5.16.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
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.SH "NAME"
Mail::SpamAssassin::Message::Metadata \- extract metadata from a message
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class is tasked with extracting \*(L"metadata\*(R" from messages for use as
Bayes tokens, fodder for eval tests, or other rules. Metadata is
supplemental data inferred from the message, like the examples below.
.PP
It is held in two forms:
.PP
1. as name-value pairs of strings, presented in mail header format. For
example, \*(L"X\-Language\*(R" => \*(L"en\*(R". This is the general form for simple
metadata that's useful as Bayes tokens, can be added to marked-up
messages using \*(L"add_header\*(R", etc., such as the trusted-relay inference
and language detection.
.PP
2. as more complex data structures on the \f(CW$msg\fR\->{metadata} object. This
is the form used for metadata like the \s-1HTML\s0 parse data, which is stored
there for access by eval rule code. Because it's not simple strings,
it's not added as a Bayes token by default (Bayes needs simple strings).
.SH "PUBLIC METHODS"
.IX Header "PUBLIC METHODS"
.IP "\fInew()\fR" 4
.IX Item "new()"