NAME

       Pandoc::Metadata - pandoc document metadata

DESCRIPTION

       Document metadata such as author, title, and date can be embedded in different documents formats.
       Metadata can be provided in Pandoc markdown format with metadata blocks
       <http://pandoc.org/MANUAL.html#metadata-blocks> at the top of a markdown file or in YAML format like
       this:

         ---
         title: a title
         author:
           - first author
           - second author
         published: true
         ...

       Pandoc supports document metadata build of strings ("MetaString"), boolean values ("MetaBool"), lists
       ("MetaList"), key-value maps ("MetaMap"), lists of inline elements ("MetaInlines") and lists of block
       elements ("MetaBlocks"). Simple strings and boolean values can also be specified via pandoc command line
       option "-M" or "--metadata":

         pandoc -M key=string
         pandoc -M key=false
         pandoc -M key=true
         pandoc -M key

       Perl module Pandoc::Elements exports functions to construct metadata elements in the internal document
       model and the general helper function "metadata".

METADATA ELEMENTS

       All "Meta..." elements support common element methods ("to_json", "name", ...) and return true for method
       "is_meta". Method "content" returns the blessed data structure and "value" returns an unblessed copy:

         $doc->meta->{author}->content->[0];   # MetaInlines
         $doc->meta->value('author')->[0];     # plain string

   value( [ $field ] )
       Called without an argument this method returns an unblessed deep copy of the metadata elements or "undef"
       if the given (sub)field does not exist.

       Can also be called with the alias "metavalue".

   MetaString
       A plain text string metadata value.

           MetaString $string
           metadata "$string"

   MetaBool
       A Boolean metadata value. The special values "false" and "FALSE" are recognized as false in addition to
       normal false values (0, "undef", "", ...).

           MetaBool $value
           metadata JSON::true()
           metadata JSON::false()

   MetaList
       A list of other metadata elements.

           MetaList [ @values ]
           metadata [ @values ]

   MetaMap
       A map of keys to other metadata elements.

           MetaMap { %map }
           metadata { %map }

   MetaInlines
       Container for a list of inlines in metadata.

           MetaInlines [ @inlines ]

   MetaBlocks
       Container for a list of blocks in metadata.

           MetaBlocks [ @blocks ]

perl v5.26.1                                       2017-08-28                              Pandoc::Metadata(3pm)