Locale::Po4a::Sgml(3)					User Contributed Perl Documentation				     Locale::Po4a::Sgml(3)

NAME

       Locale::Po4a::Sgml - convert SGML documents from/to PO files

DESCRIPTION

       The po4a (PO for anything) project goal is to ease translations (and more interestingly, the maintenance of translations) using gettext
       tools on areas where they were not expected like documentation.

       Locale::Po4a::Sgml is a module to help the translation of documentation in the SGML format into other [human] languages.

       This module uses nsgmls to parse the SGML files. Make sure it is installed.  Also make sure that the DTD of the SGML files are installed in
       the system.

OPTIONS ACCEPTED BY THIS MODULE

       debug
	   Space separated list of keywords indicating which part you want to debug. Possible values are: tag, generic, entities and refs.

       verbose
	   Give more information about what's going on.

       translate
	   Space separated list of extra tags (beside the DTD provided ones) whose content should form an extra msgid.

       section
	   Space separated list of extra tags (beside the DTD provided ones) containing other tags, some of them being of category translate.

       indent
	   Space separated list of tags which increase the indentation level.

       verbatim
	   The layout within those tags should not be changed. The paragraph won't get wrapped, and no extra indentation space or new line will be
	   added for cosmetic purpose.

       empty
	   Tags not needing to be closed.

       ignore
	   Tags ignored and considered as plain char data by po4a. That is to say that they can be part of an msgid. For example, <b> is a good
	   candidate for this category since putting it in the translate section would create msgids not being whole sentences, which is bad.

       attributes
	   A space separated list of attributes that need to be translated. You can specify the attributes by their name (for example, "lang"),
	   but you can also prefix it with a tag hierarchy, to specify that this attribute will only be translated when it is into the specified
	   tag. For example: <bbb><aaa>lang specifies that the lang attribute will only be translated if it is in an <aaa> tag, which is in a
	   <bbb> tag.  The tag names are actually regular expressions so you can also write things like <aaa|bbbb>lang to only translate lang
	   attributes that are in an <aaa> or a <bbb> tag.

       qualify
	   A space separated list of attributes for which the translation must be qualified by the attribute name. Note that this setting
	   automatically adds the given attribute into the 'attributes' list too.

       force
	   Proceed even if the DTD is unknown or if nsgmls finds errors in the input file.

       include-all
	   By default, msgids containing only one entity (like '&version;') are skipped for the translator comfort. Activating this option
	   prevents this optimisation. It can be useful if the document contains a construction like "<title>&Aacute;</title>", even if I doubt
	   such things to ever happen...

       ignore-inclusion
	   Space separated list of entities that won't be inlined.  Use this option with caution: it may cause nsgmls (used internally) to add
	   tags and render the output document invalid.

STATUS OF THIS MODULE

       The result is perfect. I.e., the generated documents are exactly the same. But there are still some problems:

       o The error output of nsgmls is redirected to /dev/null, which is clearly bad. I don't know how to avoid that.

	 The problem is that I have to "protect" the conditional inclusions (i.e. the "<! [ %foo [" and "]]>" stuff) from nsgmls. Otherwise nsgmls
	 eats them, and I don't know how to restore them in the final document. To prevent that, I rewrite them to "{PO4A-beg-foo}" and
	 "{PO4A-end}".

	 The problem with this is that the "{PO4A-end}" and such I add are valid in the document (not in a <p> tag or so).

	 Everything works well with nsgmls's output redirected that way, but it will prevent us from detecting that the document is badly
	 formatted.

       o It does work only with the DebianDoc and DocBook DTD. Adding support for a new DTD should be very easy. The mechanism is the same for
	 every DTD, you just have to give a list of the existing tags and some of their characteristics.

	 I agree, this needs some more documentation, but it is still considered as beta, and I hate to document stuff which may/will change.

       o Warning, support for DTDs is quite experimental. I did not read any reference manual to find the definition of every tag. I did add tag
	 definition to the module 'till it works for some documents I found on the net. If your document use more tags than mine, it won't work.
	 But as I said above, fixing that should be quite easy.

	 I did test DocBook against the SAG (System Administrator Guide) only, but this document is quite big, and should use most of the DocBook
	 specificities.

	 For DebianDoc, I tested some of the manuals from the DDP, but not all yet.

       o In case of file inclusion, string reference of messages in PO files (i.e. lines like "#: en/titletoc.sgml:9460") will be wrong.

	 This is because I preprocess the file to protect the conditional inclusion (i.e. the "<! [ %foo [" and "]]>" stuff) and some entities
	 (like &version;) from nsgmls because I want them verbatim to the generated document. For that, I make a temp copy of the input file and
	 do all the changes I want to this before passing it to nsgmls for parsing.

	 So that it works, I replace the entities asking for a file inclusion by the content of the given file (so that I can protect what needs
	 to be in a subfile also). But nothing is done so far to correct the references (i.e., filename and line number) afterward. I'm not sure
	 what the best thing to do is.

AUTHORS

       This module is an adapted version of sgmlspl (SGML postprocessor for the SGMLS and NSGMLS parsers) which was:

	Copyright (c) 1995 by David Megginson <dmeggins@aix1.uottawa.ca>

       The adaptation for po4a was done by:

	Denis Barbier <barbier@linuxfr.org>
	Martin Quinson (mquinson#debian.org)

COPYRIGHT AND LICENSE

	Copyright (c) 1995 by David Megginson <dmeggins@aix1.uottawa.ca>
	Copyright 2002, 2003, 2004, 2005 by SPI, inc.

       This program is free software; you may redistribute it and/or modify it under the terms of GPL (see the COPYING file).

perl v5.16.3							    2014-06-10						     Locale::Po4a::Sgml(3)