Provided by: libpod-simple-perl_3.19-1_all bug

NAME

       Pod::Simple::Subclassing -- write a formatter as a Pod::Simple subclass

SYNOPSIS

         package Pod::SomeFormatter;
         use Pod::Simple;
         @ISA = qw(Pod::Simple);
         $VERSION = '1.01';
         use strict;

         sub _handle_element_start {
           my($parser, $element_name, $attr_hash_r) = @_;
           ...
         }

         sub _handle_element_end {
           my($parser, $element_name, $attr_hash_r) = @_;
           # NOTE: $attr_hash_r is only present when $element_name is "over" or "begin"
           # The remaining code excerpts will mostly ignore this $attr_hash_r, as it is
           # mostly useless. It is documented where "over-*" and "begin" events are
           # documented.
           ...
         }

         sub _handle_text {
           my($parser, $text) = @_;
           ...
         }
         1;

DESCRIPTION

       This document is about using Pod::Simple to write a Pod processor, generally a Pod
       formatter. If you just want to know about using an existing Pod formatter, instead see its
       documentation and see also the docs in Pod::Simple.

       The zeroeth step in writing a Pod formatter is to make sure that there isn't already a
       decent one in CPAN. See <http://search.cpan.org/>, and run a search on the name of the
       format you want to render to. Also consider joining the Pod People list
       http://lists.perl.org/showlist.cgi?name=pod-people
       <http://lists.perl.org/showlist.cgi?name=pod-people> and asking whether anyone has a
       formatter for that format -- maybe someone cobbled one together but just hasn't released
       it.

       The first step in writing a Pod processor is to read perlpodspec, which contains notes
       information on writing a Pod parser (which has been largely taken care of by Pod::Simple),
       but also a lot of requirements and recommendations for writing a formatter.

       The second step is to actually learn the format you're planning to format to -- or at
       least as much as you need to know to represent Pod, which probably isn't much.

       The third step is to pick which of Pod::Simple's interfaces you want to use -- the basic
       interface via Pod::Simple or Pod::Simple::Methody is event-based, sort of like
       HTML::Parser's interface, or sort of like XML::Parser's "Handlers" interface), but
       Pod::Simple::PullParser provides a token-stream interface, sort of like HTML::TokeParser's
       interface; Pod::Simple::SimpleTree provides a simple tree interface, rather like
       XML::Parser's "Tree" interface. Users familiar with XML-handling will find one of these
       styles relatively familiar; but if you would be even more at home with XML, there are
       classes that produce an XML representation of the Pod stream, notably
       Pod::Simple::XMLOutStream; you can feed the output of such a class to whatever XML parsing
       system you are most at home with.

       The last step is to write your code based on how the events (or tokens, or tree-nodes, or
       the XML, or however you're parsing) will map to constructs in the output format. Also sure
       to consider how to escape text nodes containing arbitrary text, and also what to do with
       text nodes that represent preformatted text (from verbatim sections).

Events

       TODO intro... mention that events are supplied for implicits, like for missing >'s

       In the following section, we use XML to represent the event structure associated with a
       particular construct.  That is, TODO

       "$parser->_handle_element_start( element_name, attr_hashref )"
       "$parser->_handle_element_end( element_name  )"
       "$parser->_handle_text(  text_string  )"

       TODO describe

       events with an element_name of Document
           Parsing a document produces this event structure:

             <Document start_line="543">
               ...all events...
             </Document>

           The value of the start_line attribute will be the line number of the first Pod
           directive in the document.

           If there is no Pod in the given document, then the event structure will be this:

             <Document contentless="1" start_line="543">
             </Document>

           In that case, the value of the start_line attribute will not be meaningful; under
           current implementations, it will probably be the line number of the last line in the
           file.

       events with an element_name of Para
           Parsing a plain (non-verbatim, non-directive, non-data) paragraph in a Pod document
           produces this event structure:

               <Para start_line="543">
                 ...all events in this paragraph...
               </Para>

           The value of the start_line attribute will be the line number of the start of the
           paragraph.

           For example, parsing this paragraph of Pod:

             The value of the I<start_line> attribute will be the
             line number of the start of the paragraph.

           produces this event structure:

               <Para start_line="129">
                 The value of the
                 <I>
                   start_line
                 </I>
                  attribute will be the line number of the first Pod directive
                 in the document.
               </Para>

       events with an element_name of B, C, F, or I.
           Parsing a B<...> formatting code (or of course any of its semantically identical
           syntactic variants B<< ... >>, or B<<<< ... >>>>, etc.)  produces this event
           structure:

                 <B>
                   ...stuff...
                 </B>

           Currently, there are no attributes conveyed.

           Parsing C, F, or I codes produce the same structure, with only a different element
           name.

           If your parser object has been set to accept other formatting codes, then they will be
           presented like these B/C/F/I codes -- i.e., without any attributes.

       events with an element_name of S
           Normally, parsing an S<...> sequence produces this event structure, just as if it were
           a B/C/F/I code:

                 <S>
                   ...stuff...
                 </S>

           However, Pod::Simple (and presumably all derived parsers) offers the "nbsp_for_S"
           option which, if enabled, will suppress all S events, and instead change all spaces in
           the content to non-breaking spaces. This is intended for formatters that output to a
           format that has no code that means the same as S<...>, but which has a code/character
           that means non-breaking space.

       events with an element_name of X
           Normally, parsing an X<...> sequence produces this event structure, just as if it were
           a B/C/F/I code:

                 <X>
                   ...stuff...
                 </X>

           However, Pod::Simple (and presumably all derived parsers) offers the "nix_X_codes"
           option which, if enabled, will suppress all X events and ignore their content.  For
           formatters/processors that don't use X events, this is presumably quite useful.

       events with an element_name of L
           Because the L<...> is the most complex construct in the language, it should not
           surprise you that the events it generates are the most complex in the language. Most
           of complexity is hidden away in the attribute values, so for those of you writing a
           Pod formatter that produces a non-hypertextual format, you can just ignore the
           attributes and treat an L event structure like a formatting element that (presumably)
           doesn't actually produce a change in formatting.  That is, the content of the L event
           structure (as opposed to its attributes) is always what text should be displayed.

           There are, at first glance, three kinds of L links: URL, man, and pod.

           When a L<some_url> code is parsed, it produces this event structure:

             <L content-implicit="yes" raw="that_url" to="that_url" type="url">
               that_url
             </L>

           The "type="url"" attribute is always specified for this type of L code.

           For example, this Pod source:

             L<http://www.perl.com/CPAN/authors/>

           produces this event structure:

             <L content-implicit="yes" raw="http://www.perl.com/CPAN/authors/" to="http://www.perl.com/CPAN/authors/" type="url">
               http://www.perl.com/CPAN/authors/
             </L>

           When a L<manpage(section)> code is parsed (and these are fairly rare and not terribly
           useful), it produces this event structure:

             <L content-implicit="yes" raw="manpage(section)" to="manpage(section)" type="man">
               manpage(section)
             </L>

           The "type="man"" attribute is always specified for this type of L code.

           For example, this Pod source:

             L<crontab(5)>

           produces this event structure:

             <L content-implicit="yes" raw="crontab(5)" to="crontab(5)" type="man">
               crontab(5)
             </L>

           In the rare cases where a man page link has a specified, that text appears in a
           section attribute. For example, this Pod source:

             L<crontab(5)/"ENVIRONMENT">

           will produce this event structure:

             <L content-implicit="yes" raw="crontab(5)/&quot;ENVIRONMENT&quot;" section="ENVIRONMENT" to="crontab(5)" type="man">
               "ENVIRONMENT" in crontab(5)
             </L>

           In the rare case where the Pod document has code like L<sometext|manpage(section)>,
           then the sometext will appear as the content of the element, the manpage(section) text
           will appear only as the value of the to attribute, and there will be no
           "content-implicit="yes"" attribute (whose presence means that the Pod parser had to
           infer what text should appear as the link text -- as opposed to cases where that
           attribute is absent, which means that the Pod parser did not have to infer the link
           text, because that L code explicitly specified some link text.)

           For example, this Pod source:

             L<hell itself!|crontab(5)>

           will produce this event structure:

             <L raw="hell itself!|crontab(5)" to="crontab(5)" type="man">
               hell itself!
             </L>

           The last type of L structure is for links to/within Pod documents. It is the most
           complex because it can have a to attribute, or a section attribute, or both. The
           "type="pod"" attribute is always specified for this type of L code.

           In the most common case, the simple case of a L<podpage> code produces this event
           structure:

             <L content-implicit="yes" raw="podpage" to="podpage" type="pod">
               podpage
             </L>

           For example, this Pod source:

             L<Net::Ping>

           produces this event structure:

             <L content-implicit="yes" raw="Net::Ping" to="Net::Ping" type="pod">
               Net::Ping
             </L>

           In cases where there is link-text explicitly specified, it is to be found in the
           content of the element (and not the attributes), just as with the
           L<sometext|manpage(section)> case discussed above.  For example, this Pod source:

             L<Perl Error Messages|perldiag>

           produces this event structure:

             <L raw="Perl Error Messages|perldiag" to="perldiag" type="pod">
               Perl Error Messages
             </L>

           In cases of links to a section in the current Pod document, there is a section
           attribute instead of a to attribute.  For example, this Pod source:

             L</"Member Data">

           produces this event structure:

             <L content-implicit="yes" raw="/&quot;Member Data&quot;" section="Member Data" type="pod">
               "Member Data"
             </L>

           As another example, this Pod source:

             L<the various attributes|/"Member Data">

           produces this event structure:

             <L raw="the various attributes|/&quot;Member Data&quot;" section="Member Data" type="pod">
               the various attributes
             </L>

           In cases of links to a section in a different Pod document, there are both a section
           attribute and a to attribute.  For example, this Pod source:

             L<perlsyn/"Basic BLOCKs and Switch Statements">

           produces this event structure:

             <L content-implicit="yes" raw="perlsyn/&quot;Basic BLOCKs and Switch Statements&quot;" section="Basic BLOCKs and Switch Statements" to="perlsyn" type="pod">
               "Basic BLOCKs and Switch Statements" in perlsyn
             </L>

           As another example, this Pod source:

             L<SWITCH statements|perlsyn/"Basic BLOCKs and Switch Statements">

           produces this event structure:

             <L raw="SWITCH statements|perlsyn/&quot;Basic BLOCKs and Switch Statements&quot;" section="Basic BLOCKs and Switch Statements" to="perlsyn" type="pod">
               SWITCH statements
             </L>

           Incidentally, note that we do not distinguish between these syntaxes:

             L</"Member Data">
             L<"Member Data">
             L</Member Data>
             L<Member Data>    [deprecated syntax]

           That is, they all produce the same event structure (for the most part), namely:

             <L content-implicit="yes" raw="$depends_on_syntax" section="Member Data" type="pod">
               &#34;Member Data&#34;
             </L>

           The raw attribute depends on what the raw content of the L<> is, so that is why the
           event structure is the same "for the most part".

           If you have not guessed it yet, the raw attribute contains the raw, original,
           unescaped content of the L<> formatting code. In addition to the examples above, take
           notice of the following event structure produced by the following L<> formatting code.

             L<click B<here>|page/About the C<-M> switch>

             <L raw="click B<here>|page/About the C<-M> switch" section="About the -M switch" to="page" type="pod">
               click B<here>
             </L>

           Specifically, notice that the formatting codes are present and unescaped in raw.

           There is a known bug in the raw attribute where any surrounding whitespace is
           condensed into a single ' '. For example, given L<   link>, raw will be " link".

       events with an element_name of E or Z
           While there are Pod codes E<...> and Z<>, these do not produce any E or Z events --
           that is, there are no such events as E or Z.

       events with an element_name of Verbatim
           When a Pod verbatim paragraph (AKA "codeblock") is parsed, it produces this event
           structure:

             <Verbatim start_line="543" xml:space="preserve">
               ...text...
             </Verbatim>

           The value of the start_line attribute will be the line number of the first line of
           this verbatim block.  The xml:space attribute is always present, and always has the
           value "preserve".

           The text content will have tabs already expanded.

       events with an element_name of head1 .. head4
           When a "=head1 ..." directive is parsed, it produces this event structure:

             <head1>
               ...stuff...
             </head1>

           For example, a directive consisting of this:

             =head1 Options to C<new> et al.

           will produce this event structure:

             <head1 start_line="543">
               Options to
               <C>
                 new
               </C>
                et al.
             </head1>

           "=head2" thru "=head4" directives are the same, except for the element names in the
           event structure.

       events with an element_name of over-bullet
           When an "=over ... =back" block is parsed where the items are a bulleted list, it will
           produce this event structure:

             <over-bullet indent="4" start_line="543">
               <item-bullet start_line="545">
                 ...Stuff...
               </item-bullet>
               ...more item-bullets...
             </over-bullet fake-closer="1">

           The attribute fake-closer is only present if it is a true value; it is not present if
           it is a false value. It is shown in the above example to illustrate where the
           attribute is (in the closing tag). It signifies that the "=over" did not have a
           matching "=back", and thus Pod::Simple had to create a fake closer.

           For example, this Pod source:

             =over

             =item *

             Something

             =back

           Would produce an event structure that does not have the fake-closer attribute, whereas
           this Pod source:

             =over

             =item *

             Gasp! An unclosed =over block!

           would. The rest of the over-* examples will not demonstrate this attribute, but they
           all can have it. See Pod::Checker's source for an example of this attribute being
           used.

           The value of the indent attribute is whatever value is after the "=over" directive, as
           in "=over 8".  If no such value is specified in the directive, then the indent
           attribute has the value "4".

           For example, this Pod source:

             =over

             =item *

             Stuff

             =item *

             Bar I<baz>!

             =back

           produces this event structure:

             <over-bullet indent="4" start_line="10">
               <item-bullet start_line="12">
                 Stuff
               </item-bullet>
               <item-bullet start_line="14">
                 Bar <I>baz</I>!
               </item-bullet>
             </over-bullet>

       events with an element_name of over-number
           When an "=over ... =back" block is parsed where the items are a numbered list, it will
           produce this event structure:

             <over-number indent="4" start_line="543">
               <item-number number="1" start_line="545">
                 ...Stuff...
               </item-number>
               ...more item-number...
             </over-bullet>

           This is like the "over-bullet" event structure; but note that the contents are "item-
           number" instead of "item-bullet", and note that they will have a "number" attribute,
           which some formatters/processors may ignore (since, for example, there's no need for
           it in HTML when producing an "<UL><LI>...</LI>...</UL>" structure), but which any
           processor may use.

           Note that the values for the number attributes of "item-number" elements in a given
           "over-number" area will start at 1 and go up by one each time.  If the Pod source
           doesn't follow that order (even though it really should should!), whatever numbers it
           has will be ignored (with the correct values being put in the number attributes), and
           an error message might be issued to the user.

       events with an element_name of over-text
           These events are somewhat unlike the other over-* structures, as far as what their
           contents are.  When an "=over ... =back" block is parsed where the items are a list of
           text "subheadings", it will produce this event structure:

             <over-text indent="4" start_line="543">
               <item-text>
                 ...stuff...
               </item-text>
               ...stuff (generally Para or Verbatim elements)...
               <item-text>
               ...more item-text and/or stuff...
             </over-text>

           The indent and fake-closer attributes are as with the other over-* events.

           For example, this Pod source:

             =over

             =item Foo

             Stuff

             =item Bar I<baz>!

             Quux

             =back

           produces this event structure:

             <over-text indent="4" start_line="20">
               <item-text start_line="22">
                 Foo
               </item-text>
               <Para start_line="24">
                 Stuff
               </Para>
               <item-text start_line="26">
                 Bar
                   <I>
                     baz
                   </I>
                 !
               </item-text>
               <Para start_line="28">
                 Quux
               </Para>
             </over-text>

       events with an element_name of over-block
           These events are somewhat unlike the other over-* structures, as far as what their
           contents are.  When an "=over ... =back" block is parsed where there are no items, it
           will produce this event structure:

             <over-block indent="4" start_line="543">
               ...stuff (generally Para or Verbatim elements)...
             </over-block>

           The indent and fake-closer attributes are as with the other over-* events.

           For example, this Pod source:

             =over

             For cutting off our trade with all parts of the world

             For transporting us beyond seas to be tried for pretended offenses

             He is at this time transporting large armies of foreign mercenaries to
             complete the works of death, desolation and tyranny, already begun with
             circumstances of cruelty and perfidy scarcely paralleled in the most
             barbarous ages, and totally unworthy the head of a civilized nation.

             =back

           will produce this event structure:

             <over-block indent="4" start_line="2">
               <Para start_line="4">
                 For cutting off our trade with all parts of the world
               </Para>
               <Para start_line="6">
                 For transporting us beyond seas to be tried for pretended offenses
               </Para>
               <Para start_line="8">
                 He is at this time transporting large armies of [...more text...]
               </Para>
             </over-block>

       events with an element_name of over-empty
           Note: These events are only triggered if "parse_empty_lists()" is set to a true value.

           These events are somewhat unlike the other over-* structures, as far as what their
           contents are.  When an "=over ... =back" block is parsed where there is no content, it
           will produce this event structure:

             <over-empty indent="4" start_line="543">
             </over-empty>

           The indent and fake-closer attributes are as with the other over-* events.

           For example, this Pod source:

             =over

             =over

             =back

             =back

           will produce this event structure:

             <over-block indent="4" start_line="1">
               <over-empty indent="4" start_line="3">
               </over-empty>
             </over-block>

           Note that the outer "=over" is a block because it has no "=item"s but still has
           content: the inner "=over". The inner "=over", in turn, is completely empty, and is
           treated as such.

       events with an element_name of item-bullet
           See "events with an element_name of over-bullet", above.

       events with an element_name of item-number
           See "events with an element_name of over-number", above.

       events with an element_name of item-text
           See "events with an element_name of over-text", above.

       events with an element_name of for
           TODO...

       events with an element_name of Data
           TODO...

More Pod::Simple Methods

       Pod::Simple provides a lot of methods that aren't generally interesting to the end user of
       an existing Pod formatter, but some of which you might find useful in writing a Pod
       formatter. They are listed below. The first several methods (the accept_* methods) are for
       declaring the capabilities of your parser, notably what "=for targetname" sections it's
       interested in, what extra N<...> codes it accepts beyond the ones described in the
       perlpod.

       "$parser->accept_targets( SOMEVALUE )"
           As the parser sees sections like:

               =for html  <img src="fig1.jpg">

           or

               =begin html

                 <img src="fig1.jpg">

               =end html

           ...the parser will ignore these sections unless your subclass has specified that it
           wants to see sections targetted to "html" (or whatever the formatter name is).

           If you want to process all sections, even if they're not targetted for you, call this
           before you start parsing:

             $parser->accept_targets('*');

       "$parser->accept_targets_as_text(  SOMEVALUE  )"
           This is like accept_targets, except that it specifies also that the content of
           sections for this target should be treated as Pod text even if the target name in
           "=for targetname" doesn't start with a ":".

           At time of writing, I don't think you'll need to use this.

       "$parser->accept_codes( Codename, Codename...  )"
           This tells the parser that you accept additional formatting codes, beyond just the
           standard ones (I B C L F S X, plus the two weird ones you don't actually see in the
           parse tree, Z and E). For example, to also accept codes "N", "R", and "W":

               $parser->accept_codes( qw( N R W ) );

           TODO: document how this interacts with =extend, and long element names

       "$parser->accept_directive_as_data( directive_name )"
       "$parser->accept_directive_as_verbatim( directive_name )"
       "$parser->accept_directive_as_processed( directive_name )"
           In the unlikely situation that you need to tell the parser that you will accept
           additional directives ("=foo" things), you need to first set the parser to treat its
           content as data (i.e., not really processed at all), or as verbatim (mostly just
           expanding tabs), or as processed text (parsing formatting codes like B<...>).

           For example, to accept a new directive "=method", you'd presumably use:

               $parser->accept_directive_as_processed("method");

           so that you could have Pod lines like:

               =method I<$whatever> thing B<um>

           Making up your own directives breaks compatibility with other Pod formatters, in a way
           that using "=for target ..." lines doesn't; however, you may find this useful if
           you're making a Pod superset format where you don't need to worry about compatibility.

       "$parser->nbsp_for_S( BOOLEAN );"
           Setting this attribute to a true value (and by default it is false) will turn "S<...>"
           sequences into sequences of words separated by "\xA0" (non-breaking space) characters.
           For example, it will take this:

               I like S<Dutch apple pie>, don't you?

           and treat it as if it were:

               I like DutchE<nbsp>appleE<nbsp>pie, don't you?

           This is handy for output formats that don't have anything quite like an "S<...>" code,
           but which do have a code for non-breaking space.

           There is currently no method for going the other way; but I can probably provide one
           upon request.

       "$parser->version_report()"
           This returns a string reporting the $VERSION value from your module (and its
           classname) as well as the $VERSION value of Pod::Simple.  Note that perlpodspec
           requires output formats (wherever possible) to note this detail in a comment in the
           output format.  For example, for some kind of SGML output format:

               print OUT "<!-- \n", $parser->version_report, "\n -->";

       "$parser->pod_para_count()"
           This returns the count of Pod paragraphs seen so far.

       "$parser->line_count()"
           This is the current line number being parsed. But you might find the "line_number"
           event attribute more accurate, when it is present.

       "$parser->nix_X_codes(  SOMEVALUE  )"
           This attribute, when set to a true value (and it is false by default) ignores any
           "X<...>" sequences in the document being parsed.  Many formats don't actually use the
           content of these codes, so have no reason to process them.

       "$parser->merge_text(  SOMEVALUE  )"
           This attribute, when set to a true value (and it is false by default) makes sure that
           only one event (or token, or node) will be created for any single contiguous sequence
           of text.  For example, consider this somewhat contrived example:

               I just LOVE Z<>hotE<32>apple pie!

           When that is parsed and events are about to be called on it, it may actually seem to
           be four different text events, one right after another: one event for "I just LOVE ",
           one for "hot", one for " ", and one for "apple pie!". But if you have merge_text on,
           then you're guaranteed that it will be fired as one text event:  "I just LOVE hot
           apple pie!".

       "$parser->code_handler(  CODE_REF  )"
           This specifies code that should be called when a code line is seen (i.e., a line
           outside of the Pod).  Normally this is undef, meaning that no code should be called.
           If you provide a routine, it should start out like this:

               sub get_code_line {  # or whatever you'll call it
                 my($line, $line_number, $parser) = @_;
                 ...
               }

           Note, however, that sometimes the Pod events aren't processed in exactly the same
           order as the code lines are -- i.e., if you have a file with Pod, then code, then more
           Pod, sometimes the code will be processed (via whatever you have code_handler call)
           before the all of the preceding Pod has been processed.

       "$parser->cut_handler(  CODE_REF  )"
           This is just like the code_handler attribute, except that it's for "=cut" lines, not
           code lines. The same caveats apply. "=cut" lines are unlikely to be interesting, but
           this is included for completeness.

       "$parser->pod_handler(  CODE_REF  )"
           This is just like the code_handler attribute, except that it's for "=pod" lines, not
           code lines. The same caveats apply. "=pod" lines are unlikely to be interesting, but
           this is included for completeness.

       "$parser->whiteline_handler(  CODE_REF  )"
           This is just like the code_handler attribute, except that it's for lines that are
           seemingly blank but have whitespace (" " and/or "\t") on them, not code lines. The
           same caveats apply. These lines are unlikely to be interesting, but this is included
           for completeness.

       "$parser->whine( linenumber, complaint string )"
           This notes a problem in the Pod, which will be reported to in the "Pod Errors" section
           of the document and/or send to STDERR, depending on the values of the attributes
           "no_whining", "no_errata_section", and "complain_stderr".

       "$parser->scream( linenumber, complaint string )"
           This notes an error like "whine" does, except that it is not suppressible with
           "no_whining". This should be used only for very serious errors.

       "$parser->source_dead(1)"
           This aborts parsing of the current document, by switching on the flag that indicates
           that EOF has been seen.  In particularly drastic cases, you might want to do this.
           It's rather nicer than just calling "die"!

       "$parser->hide_line_numbers( SOMEVALUE )"
           Some subclasses that indiscriminately dump event attributes (well, except for ones
           beginning with "~") can use this object attribute for refraining to dump the
           "start_line" attribute.

       "$parser->no_whining( SOMEVALUE )"
           This attribute, if set to true, will suppress reports of non-fatal error messages.
           The default value is false, meaning that complaints are reported.  How they get
           reported depends on the values of the attributes "no_errata_section" and
           "complain_stderr".

       "$parser->no_errata_section( SOMEVALUE )"
           This attribute, if set to true, will suppress generation of an errata section.  The
           default value is false -- i.e., an errata section will be generated.

       "$parser->complain_stderr( SOMEVALUE )"
           This attribute, if set to true will send complaints to STDERR.  The default value is
           false -- i.e., complaints do not go to STDERR.

       "$parser->bare_output( SOMEVALUE )"
           Some formatter subclasses use this as a flag for whether output should have prologue
           and epilogue code omitted. For example, setting this to true for an HTML formatter
           class should omit the "<html><head><title>...</title><body>..." prologue and the
           "</body></html>" epilogue.

           If you want to set this to true, you should probably also set "no_whining" or at least
           "no_errata_section" to true.

       "$parser->preserve_whitespace( SOMEVALUE )"
           If you set this attribute to a true value, the parser will try to preserve whitespace
           in the output.  This means that such formatting conventions as two spaces after
           periods will be preserved by the parser.  This is primarily useful for output formats
           that treat whitespace as significant (such as text or *roff, but not HTML).

       "$parser->parse_empty_lists( SOMEVALUE )"
           If this attribute is set to true, the parser will not ignore empty "=over"/"=back"
           blocks. The type of "=over" will be empty, documented above, "events with an
           element_name of over-empty".

SEE ALSO

       Pod::Simple -- event-based Pod-parsing framework

       Pod::Simple::Methody -- like Pod::Simple, but each sort of event calls its own method
       (like "start_head3")

       Pod::Simple::PullParser -- a Pod-parsing framework like Pod::Simple, but with a token-
       stream interface

       Pod::Simple::SimpleTree -- a Pod-parsing framework like Pod::Simple, but with a tree
       interface

       Pod::Simple::Checker -- a simple Pod::Simple subclass that reads documents, and then makes
       a plaintext report of any errors found in the document

       Pod::Simple::DumpAsXML -- for dumping Pod documents as tidily indented XML, showing each
       event on its own line

       Pod::Simple::XMLOutStream -- dumps a Pod document as XML (without introducing extra
       whitespace as Pod::Simple::DumpAsXML does).

       Pod::Simple::DumpAsText -- for dumping Pod documents as tidily indented text, showing each
       event on its own line

       Pod::Simple::LinkSection -- class for objects representing the values of the TODO and TODO
       attributes of L<...> elements

       Pod::Escapes -- the module the Pod::Simple uses for evaluating E<...> content

       Pod::Simple::Text -- a simple plaintext formatter for Pod

       Pod::Simple::TextContent -- like Pod::Simple::Text, but makes no effort for indent or wrap
       the text being formatted

       Pod::Simple::HTML -- a simple HTML formatter for Pod

       perlpod

       perlpodspec

       perldoc

SUPPORT

       Questions or discussion about POD and Pod::Simple should be sent to the
       pod-people@perl.org mail list. Send an empty email to pod-people-subscribe@perl.org to
       subscribe.

       This module is managed in an open GitHub repository, http://github.com/theory/pod-simple/
       <http://github.com/theory/pod-simple/>. Feel free to fork and contribute, or to clone
       git://github.com/theory/pod-simple.git <git://github.com/theory/pod-simple.git> and send
       patches!

       Patches against Pod::Simple are welcome. Please send bug reports to
       <bug-pod-simple@rt.cpan.org>.

COPYRIGHT AND DISCLAIMERS

       Copyright (c) 2002 Sean M. Burke.

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

       This program is distributed in the hope that it will be useful, but without any warranty;
       without even the implied warranty of merchantability or fitness for a particular purpose.

AUTHOR

       Pod::Simple was created by Sean M. Burke <sburke@cpan.org>.  But don't bother him, he's
       retired.

       Pod::Simple is maintained by:

       ·   Allison Randal "allison@perl.org"

       ·   Hans Dieter Pearcey "hdp@cpan.org"

       ·   David E. Wheeler "dwheeler@cpan.org"