/usr/share/perl5/Image/MetaData/JPEG/parsers/app1_xmp.pl is in libimage-metadata-jpeg-perl 0.153-1.
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# A Perl package for showing/modifying JPEG (meta)data. #
# Copyright (C) 2004,2005,2006 Stefano Bettelli #
# See the COPYING and LICENSE files for license terms. #
###########################################################
use Image::MetaData::JPEG::data::Tables qw(:TagsAPP1_XMP);
no integer;
use strict;
use warnings;
###########################################################
# This method is the entry point for APP1 XMP segments. #
# Such APP1 segments are used by Adobe for recording an #
# XMP packet in JPEG files (this is a special XML block #
# storing metadata information, similarly to Exif APP1 or #
# IPTC APP13). The advantage of XMP is that it is exten- #
# sible and that it can be embedded in many file types, #
# like JPEG, PNG, GIF, HTML, PDF, PostScript, ecc... #
# Only the envelope changes. The format is the following: #
#---------------------------------------------------------#
# 29 bytes namespace = http://ns.adobe.com/xap/1.0/\000 #
# .... XMP packet (in some Unicode encoding) #
#=========================================================#
# First, check that the mandatory Adobe namespace string #
# is there. Then, parse the XML and save the intermediate #
# results. Last, Check that the XML block conforms to the #
# RDF and XMP specifications (issue an error otherwise). #
###########################################################
# Ref: "XMP Specification", version 3.2, June 2005, Adobe #
# Systems Inc., San Jose, CA, http://www.adobe.com #
###########################################################
sub parse_app1_xmp {
my ($this) = @_;
# slurp the segment as a single string
my $packet = $this->read_record($ASCII, 0, $this->size());
# get rid of newline chars
$packet =~ y/\n\r//d;
# the ID must be Adobe's namespace; die if it is not correct
$packet =~ s/^($APP1_XMP_TAG|.{0,15})(.*)$/$2/;
$this->die("Incorrect XMP namespace ($1)") unless $1 eq $APP1_XMP_TAG;
$this->store_record('NAMESPACE', $ASCII, \ "$1");
# (TODO): find the used Unicode encoding and deal with it
use Encode; Encode::_utf8_on($packet);
# analyse the XML packet (this cannot fail)
$this->parse_xml_string(\ $packet); # writes into $this->{private_list}
#print join '::', @$_, "\n" for @{$this->{private_list}};
# check header (xpacket, x:x[am]pmeta and the outer rdf:RDF)
$this->test_xmp_header();
# test that XMP syntax is correct; [Dlist(ABOUT)] := [Desc(ABOUT)]+
$this->parse_rdf_description()
while $this->list_equal(['OPEN', 'rdf:Description']);
# cleanup
delete $this->{private_list};
}
###########################################################
# This private method runs a series of regular expression #
# match tests against the private list (starting at posi- #
# tion $offset). $regexps_array is either a reference to #
# a list of references to regexp rules, or a reference to #
# a single such list. A regexp rule consists of a list of #
# regular express.s and variables to assign submatches to.#
###########################################################
sub list_equal {
my ($this, $regexps_array, $offset) = (@_, 0);
# convert a single rule into a list of rules
$regexps_array = [$regexps_array] unless ref $$regexps_array[0] eq 'ARRAY';
# check each rule separately, return as soon as possible
for my $pos ($offset..$offset + $#$regexps_array) {
return 0 unless exists $this->{private_list}->[$pos];
# do not modify the private list for the time being
my $elements = [ @{$this->{private_list}->[$pos]} ];
my $regexps = $regexps_array->[$pos];
while (@{$regexps}) {
return 0 unless @$elements;
my ($e, $r) = (shift(@$elements), shift(@$regexps));
my @matches = $e =~ /^$r$/; return 0 unless @matches;
${shift @$regexps} = shift @matches while ref $$regexps[0]; } }
return 1 + $#$regexps_array; }
###########################################################
# This private method is almost the same as list_equal, #
# but, if the match is positive, it also removes matching #
# lines from the private list. #
###########################################################
sub list_extract {
my ($this, $regexps_array, $offset, $number) = (@_, 0);
my $lines = $this->list_equal($regexps_array, $offset) || return 0;
splice @{$this->{private_list}}, $offset, $lines; return 1; }
###########################################################
# Private method for saving a piece of information into #
# the private list (always undefined type). Arguments are:#
# $pdir --> (list ref) identifies a subdirectory #
# $name --> of the Record to be saved #
# $value --> content to be saved in the Record #
# $extra --> optonal info for {extra} field of a Record #
###########################################################
sub store_xmp_value {
my ($this, $pdir, $name, $value, $extra) = @_;
my $rec = $this->store_record
($this->provide_subdirectory(@$pdir), $name, $UNDEF, \$value);
$rec->{extra} = $extra if $extra; }
###########################################################
# Private method for the extracting a list of attributes #
# and saving them in the private list; the arguments are: #
# $pdir --> (list ref) identifies a subdirectory #
# $regexp --> to match the attribute name against #
# $extra --> info for the {extra} field of a Record #
###########################################################
sub extract_attributes {
my ($this, $pdir, $regexp, $extra) = @_; my ($name, $value, %summary)= ();
$this->store_xmp_value($pdir, $name, $value, $extra),
$summary{$name} = $value while $this->list_extract
(['ATTRIBUTE', $regexp, \$name, '(.*)', \$value]);
return \ %summary; }
###########################################################
# This private method parses a generic XML string and #
# writes its findings in an array of array references. #
# Each sublist in the main list starts with a sublist #
# type, which can be OPEN, OPEN_ABBR, OPEN_SPECIAL, #
# ATTRIBUTE, COMMENT, CONTENT or CLOSE. The parsing algo- #
# rithm is my current understanding of what XML is ..... #
# ------------------------------------------------------- #
# Spaces before a tag are not meaningful, but they cannot #
# be thrown away before textual values. Keeping track of #
# this condition is the reason for the $f flag. #
###########################################################
sub parse_xml_string {
my ($this, $string) = @_;
# initialisation of this private, intermediate list
$this->{private_list} = [] unless exists $this->{private_list};
# some variables and their initialisation
my $mkp_tag = qr/[\w:-]+/o; my $spaces; my $f = 0;
# how to push a new list of strings onto the private list
my $lpush = sub { push @{$this->{private_list}}, [@_] };
# how to extract the attribute list of a tag
my $apush = sub { my ($p) = @_; &$lpush('ATTRIBUTE', $1, $3) while $p
=~ s/^\s*($mkp_tag)=([\'\"])([^\'\"]*)\2//o;
&$lpush('IMPOSSIBLE', $p) if $p; };
PARSE_LOOP:
# extract spaces at the beginning (they are important for content!)
$$string =~ s/^(\s*)//o; $spaces = $1 || '';
# try to speed regular expressions up by lookint at the
# first two characters of the current string
if (substr($$string, 0, 1) eq '<') {
my $s = substr($$string, 1, 1);
# extract a closing markup
if ($s eq '/' && $$string =~ s/^<\/($mkp_tag)>//o) {
&$lpush('CONTENT', $spaces) if $f; $f=0; &$lpush('CLOSE', $1); }
# extract a comment, if present ( <!-- comment --> )
elsif ($s eq '!' && $$string =~ s/^<!-- *(.*?) *-->//o) {
&$lpush('COMMENT', $1); $f=0; }
# extract header tags ( <?some:thing val='1'?> ) + attributes
elsif ($s eq '?' && $$string =~ s/^<\?($mkp_tag) ?([^\?]*?)\?>//o) {
&$lpush('OPEN_SPECIAL', $1); &$apush($2) if $2; $f=0; }
# extract an opening markup with or without attributes
# extract also self-contained tags ( <.... /> ), (not closing)
elsif ($$string =~ s/^<($mkp_tag) ?([^\?]*?)(\/?)>//o) {
&$lpush($3 ? 'OPEN_ABBR' : 'OPEN', $1); &$apush($2) if $2;
$3 ? &$lpush ('CLOSE_ABBR') : $f = 1; }
# an impossible case
else { &$lpush('IMPOSSIBLE', $$string) if $string; $$string = ""; }
# extract content (spaces are important ...)
} else { $$string =~ s/^([^<]+)//o; &$lpush('CONTENT', $spaces.$1); $f=0; }
# parse the rest of the string
$$string ? goto PARSE_LOOP : return;
}
###########################################################
# Framework for the XMP packet. The packet content is #
# sandwiched between a header and a trailer, and may #
# contain padding whitespaces at the end. The 'xpacket' #
# header has two mandatory attributes, 'begin' and 'id' #
# (order is important), separated by exactly one space. #
# Attribute values, here and in the following, are enclo- #
# sed by single quotes or double quotes. The value of #
# 'begin' must be the Unicode "zero-width non-breaking #
# space" (U+FEFF); an empty value is also acceptable (for #
# backward compatibility), and means UTF-8. The value of #
# 'id' is fixed. Other attributes may be ignored. A pad- #
# ding of 2KB or 4KB, with a newline every 100 spaces, is #
# recommended. The 'end' attribute of the trailer may #
# have a value of "r" (read-only) or "w" (modifiable). #
# ------------------------------------------------------- #
# The structure of the packet content is as follows. #
# There is an optional x:xmpmeta (or x:xapmeta for older #
# files) element, with a mandatory xmlns:x attribute set #
# to "adobe:ns:meta/" and other optional attributes, #
# which can be ignored. Inside it (or at top level, if it #
# is absent), there is exactly one rdf:RDF element with #
# an attribute specifying the xmlns:rdf namespace (other #
# namespaces can be listed here as additional attributes).#
# Inside the 'rdf:RDF' element then, all XMP properties #
# are stored inside one or more rdf:Description element. #
# ------------------------------------------------------- #
# <?xpacket begin="..." id="...XMP id ..." ...?> #
# <x:xmpmeta xmlns:x='adobe:ns:meta/' ..attributes..> #
# <rdf:RDF xmlns:rdf="...URI..."> #
# [rdf:Description]+ #
# </rdf:RDF> #
# </x:xmpmeta> #
# ... padding with XML whitespaces ... #
# <?xpacket end="w"?> #
###########################################################
sub test_xmp_header {
my ($this) = @_;
my ($rw, $filter, $f1, $f2, $meta, $ns, $URI) = ();
# search for <?xpacket begin="..." id="...XMP id ...";
$this->list_extract(['OPEN_SPECIAL', 'xpacket'])
|| $this->die('XMP not starting with "xpacket"');
$this->list_extract(['ATTRIBUTE', 'begin', $APP1_XMP_XPACKET_BEGIN])
|| $this->die('XMP xpacket-begin not zero-width Unicode space');
$this->list_extract(['ATTRIBUTE', 'id', $APP1_XMP_XPACKET_ID])
|| $this->die('XMP xpacket-id not correct');
# extract all additional attributes in the opening tag
$this->extract_attributes(['XMP_HEADER'], '(.*)', 'xpacket');
# search for <?xpacket end="w|r"?> at the end
$this->list_extract(['ATTRIBUTE', 'end', '(w|r)', \$rw], -1)
|| $this->die('XMP xpacket end attribute not found');
$this->list_extract(['OPEN_SPECIAL', 'xpacket'], -1) # OPEN, not CLOSE ...
|| $this->die('XMP not ending with "xpacket"');
$this->store_xmp_value(['XMP_HEADER'], 'xpacket-rw', $rw);
# extract additional filters (are these undocumented?)
while ($this->list_extract(['OPEN_SPECIAL', '(.*)', \$filter])) {
$this->list_extract(['ATTRIBUTE', '(.*)', \$f1, '(.*)', \$f2]);
$this->store_xmp_value(['XMP_HEADER'], $filter, "$f1=\"$f2\""); }
# take care of the xmpmeta/xapmeta tags, if present
$this->list_extract(['OPEN', '(x:x[am]pmeta)', \$meta]) || goto NO_XMPMETA;
$this->store_xmp_value(['XMP_HEADER'], 'meta', $meta);
$this->list_extract(['CLOSE', $meta], -1)
|| $this->die('XMP x:x[am]pmeta not closing');
$this->list_extract(['ATTRIBUTE', 'xmlns:x', $APP1_XMP_META_NS])
|| $this->die('XMP x:x[am]pmeta without namespace');
$this->extract_attributes(['XMP_HEADER'], '(.*)', 'meta');
NO_XMPMETA:
# take care of the outer rdf:RDF and its namespace
$this->list_extract(['OPEN', 'rdf:RDF'])
|| $this->die('Outer rdf:RDF not found');
$this->list_extract(['ATTRIBUTE', 'xmlns:rdf', $APP1_XMP_OUTER_RDF_NS])
|| $this->die('Namespace not correct/found in outer rdf:RDF');
$this->list_extract(['CLOSE', 'rdf:RDF'], -1)
|| $this->die('Outer rdf:RDF not closing');
# save additional namespaces if present (undocumented?)
$this->extract_attributes(['SCHEMAS'], 'xmlns:(.*)', 'rdf:RDF');
# extract all rdf:about and check that they are the same
# (sometimes 'rdf:' is missing, how should I treat this case?)
my @abouts = map { $$_[2] } grep { $$_[1] =~ /(rdf:|)about/ }
grep { $$_[0] eq 'ATTRIBUTE' } @{$this->{private_list}};
$this->die("Inconsistent rdf:about's") if grep { $_ ne $abouts[0]} @abouts;
$this->store_xmp_value(['XMP_HEADER'], 'rdf:about', $abouts[0]);
}
###########################################################
# Description elements: rdf:Description elements and XMP #
# schemas are usually in one-to-one correspondence. Each #
# element has two mandatory attributes, 'rdf:about' and #
# 'xmlns:NAME'. 'rdf:about' is usually empty (however, it #
# can contain an application specific URI), and its value #
# *must* be shared among all rdf:Description elements. #
# 'xmlns:NAME' specifies the local namespace prefix (NAME #
# stands for the actual prefix). Additional namespaces #
# can be specified via 'xmlns' attributes. #
# ------------------------------------------------------- #
# [rdf:Description] := <rdf:Description rdf:About='ABOUT' #
# xmlns:NAME='text' ..ns..> #
# [property(NAME)]+ #
# </rdf:Description> #
# ------------------------------------------------------- #
# There exists also an abbreviated form where properties #
# are listed as attributes of the rdf:Description tag (in #
# this case there is no closing rdf:Description> tag, and #
# the opening tags ends with the '/' character). #
# ------------------------------------------------------- #
# [rdf:Description] := <rdf:Description rdf:About='ABOUT' #
# xmlns:NAME='text' [inlineP(NAME)]+/> #
# [inlineP(NAME)] := "NAME:name='value'" #
###########################################################
sub parse_rdf_description {
my ($this) = @_; my ($type, $ns) = ();
# extract description opening ($type is OPEN or OPEN_ABBR)
$this->list_extract(['(OPEN.*)', \$type, 'rdf:Description']) ||
$this->die('first-level rdf:Description opening tag not found');
# mandatory rdf:about attribute (its value is already checked)
$this->list_extract(['ATTRIBUTE', '(rdf:|)about', '.*'])
|| $this->die('rdf:about failure (missing or inconsistent)');
# mandatory main namespace in xmlns:abbreviation
$this->list_equal(['ATTRIBUTE', 'xmlns:.*', '.*'])
|| $this->die('rdf:Description namespace not found');
# extract all additional namespaces (and find the secondary one)
# the exact meaning of this operation is to be clarified (TODO)
my $nss = $this->extract_attributes(['SCHEMAS'], 'xmlns:(.*)');
do { $ns = $_ if $$nss{$_}!~ /\#$/ && ! defined $ns } for keys %$nss;
# if $type is OPEN_ABBR, all simple properties are attributes
$this->extract_attributes(['PROPERTIES'], '(.*)', 'abbr'), return
if $type eq 'OPEN_ABBR';
# some rdf:Description's are there only as placeholders (only empty
# content) --> do not try to extract properties in this case. In
# the general case, parse all properties in this rdf:Description
unless ($this->list_extract(['CONTENT', '\s*'])) {
$this->parse_rdf_property($ns, ['PROPERTIES'])
while ! $this->list_equal(['CLOSE', 'rdf:Description']); }
# parse the close tag of rdf:Description
$this->list_extract(['CLOSE', 'rdf:Description'])
|| $this->die('first-level rdf:Description closing tag not found');
1 }
###########################################################
# This private method is a dispatcher for the abstract #
# concept of XMP property. Actual properties are either #
# simple or structured or they are array properties. #
# ------------------------------------------------------- #
# [property(NAME)] := [simpleP(NAME)] #
# or [structuredP(NAME)] #
# or [arrayP(NAME)] #
###########################################################
sub parse_rdf_property {
my ($this, $ns, $pdir) = @_;
$this->parse_comment ($ns, $pdir) ||
$this->parse_rdf_simple_property($ns, $pdir) ||
$this->parse_rdf_struct_property($ns, $pdir) ||
$this->parse_rdf_array_property ($ns, $pdir) ||
$this->die('parse_rdf_property: unhandled case');
1 }
###########################################################
# Comments: this is undocumented in the XMP manual by #
# Adobe, but there is evidence that some properties may #
# be replaced by a comment, usually carrying its name. #
# ------------------------------------------------------- #
# [comment] := <!-- this is a comment --> #
###########################################################
sub parse_comment {
my ($this, $ns, $pdir) = @_; my $comment = '';
return 0 unless $this->list_extract(['COMMENT', '(.*)', \$comment]);
$this->store_xmp_value($pdir, "$ns:COMMENT", $comment);
1 }
###########################################################
# Simple properties: a simple property is usually just #
# some literal value between opening and closing tags #
# carrying the property name; it can have qualifiers #
# (attributes). Just to make things easier, it seems that #
# there is the (undocumented) possibility of replacing #
# the property value (text) with a sequence of general #
# properties (i.e., a clone of a structured property ...) #
# ------------------------------------------------------- #
# [simpleP(NAME)] := <NAME:name [qualifier]*>text</NAME:name>
# or <NAME:name [qualifier]*>[property(name)]+</NAME:name>
# [qualifier] := "name:pnam='text'" #
###########################################################
sub parse_rdf_simple_property {
my ($this, $ns, $pdir) = @_; my ($name, $n, $content, $v) = ();
# try to match structure and return on failure; indeed, it
# is difficult to "match" a simple property, so, we try to
# exclude all other cases here ...
return 0 if $this->list_equal([['OPEN', '.*'], ['OPEN', 'rdf:.*']]);
# extract the opening tag with the property name
$this->list_extract(['OPEN', "($ns:.*)", \$name])
|| $this->die('simple property: error at opening tag');
# property qualifiers not yet supported yet!! (TODO)
# case I: the value is simply text
if ($this->list_extract(['CONTENT', '(.*)', \$content])) {
$this->store_xmp_value($pdir, $name, $content); }
# case II: the "value" is a sequence of properties
# this is to be clarified .... (TODO)
else { push @$pdir, $name;
$this->extract_attributes($pdir, '(.*)', 'ATTRIBUTE');
$this->store_xmp_value($pdir, 'CONTENT', $v)
while $this->list_extract(['CONTENT', '(.*)', \$v]);
$this->parse_rdf_simple_property($ns, $pdir)
while ! $this->list_equal(['CLOSE', "$name"]);
pop @$pdir; }
# closing tag
$this->list_extract(['CLOSE', "$name"])
|| $this->die('simple property: error at closing tag');
1 }
###########################################################
# Structured properties: agglomerates of properties of #
# different type. The inner properties are stored inside #
# a secondary rdf:Description tag, which also contains a #
# secondary namespace definition, to be used by inner #
# properties. I hope this is all. #
# ------------------------------------------------------- #
# [structuredP(NAME)] := <NAME:name> #
# <rdf:Description xmlns:N2="...">
# [property(N2)]+ #
# </rdf:Description> #
# </NAME:name> #
###########################################################
sub parse_rdf_struct_property {
my ($this, $ns, $pdir) = @_; my ($name, $ns_2, $ns_2_v) = ();
# try to match structure and return on failure
return 0 unless $this->list_extract
(['OPEN', "$ns:(.*)", \$name], ['OPEN', 'rdf:Description'],
['ATTRIBUTE', 'xmlns:(.*)', \$ns_2, '(.*)', \$ns_2_v]);
# store the property content
$this->store_xmp_value(['SCHEMAS'], $ns_2, $ns_2_v);
# get all embedded properties
$this->parse_rdf_property($ns_2, [@$pdir, $name])
while ! $this->list_equal(['CLOSE', $name]);
# find where tags are closing
$this->list_extract(['CLOSE', $name])
|| $this->die('structured property: error at closing tag');
1 }
###########################################################
# Array properties: rdf:Seq is for an ordered list of #
# properties, rdf:Bag for an unordered set of properties #
# and rdf:Alt for a list of alternatives. Items are most #
# often homogeneous, but this is not a rule. There is a #
# namespace problem for qualified items (TODO) #
# ------------------------------------------------------- #
# [arrayP(NAME)] := <NAME:name> #
# <rdf:[Bag|Seq|Alt]> #
# [item]+ #
# </rdf:[Bag|Seq|Alt]> #
# </NAME:name> #
# [item] := [simple_item] or [prop_item] or #
# [qualif_item(N2)] or [lang_item] #
# ------------------------------------------------------- #
# Note: a [lang_item] can be found only in an rdf:Alt, #
# and this rdf:Alt must in turn contain only [lang_item] #
# items, but this check is not yet implemented (TODO). #
###########################################################
sub parse_rdf_array_property {
my ($this, $ns, $pdir) = @_; my ($name, $type) = ();
# try to match structure and return on failure
return 0 unless $this->list_extract
([['OPEN',"($ns:.*)",\$name], ['OPEN','(rdf:(Bag|Seq|Alt))',\$type]]);
# get all items in this array property
while (! $this->list_equal(['CLOSE', $type])) {
$this->parse_rdf_item ([@$pdir, $name]) && next;
$this->parse_rdf_item_lang ([@$pdir, $name]) && next;
$this->parse_rdf_item_property ([@$pdir, $name]) && next;
$this->parse_rdf_item_qualified([@$pdir, $name]) && next;
$this->die('parse_rdf_array_property: unhandled case'); }
# store the property type in the subdirectory
$this->search_record(@$pdir, $name)->{extra} = $type;
# find where tags are closing
$this->list_extract([['CLOSE', $type], ['CLOSE', "$name"]])
|| $this->die('array property: error at closing tag');
1 }
###########################################################
# Simple items: just text strings inside rdf:li tags. It #
# is the simplest case for rdf:Bag, rdf:Set and rdf:Alt #
# array properties. It does not need a subdirectory. #
# ------------------------------------------------------- #
# [simple_item] := <rdf:li>text<rdf:li> #
###########################################################
sub parse_rdf_item {
my ($this, $pdir) = @_; my ($content) = ();
# try to match structure and return on failure
return 0 unless $this->list_extract
([['OPEN','rdf:li'],['CONTENT','(.*)',\$content],['CLOSE','rdf:li']]);
# store the property content
$this->store_xmp_value($pdir, 'ITEM', $content);
1 }
###########################################################
# Property items: these items contain another property #
# which is not simple text, e.g., a structured property #
# or an array property. Additional qualifiers can be spe- #
# cified as attributes of the rdf:li tag. Such properties #
# in general require their own subdirectories. #
# ------------------------------------------------------- #
# [prop_item] := <rdf:li [qualifier]>[simplP(NAME)]<rdf:li>
###########################################################
sub parse_rdf_item_property {
my ($this, $pdir) = @_; my ($name, $value) = ();
# try to match structure and return on failure
return 0 unless $this->list_equal
([['OPEN', 'rdf:li'], ['ATTRIBUTE', 'rdf:.*', '.*'], ['OPEN', '.*']]);
$this->list_extract([['OPEN', 'rdf:li'],
['ATTRIBUTE', '(rdf:.*)', \$name, '(.*)', \$value]]);
# store the property content
$this->store_xmp_value([@$pdir, 'ITEM'], $name, $value, 'QUALIFIER');
# this is plainly wrong: how to extract the correct namespace? TODO
$this->parse_rdf_property('stJob', [@$pdir, 'ITEM']);
$this->list_extract(['CLOSE', 'rdf:li'])
|| $this->die('item_property: error at closing tag');
1 }
###########################################################
# Qualified items: these items can be found inside an #
# array property ('Bag', 'Seq' or 'Alt') and differ from #
# standard items because they do not only have a value, #
# but also one or more "qualifiers"; they remain unnamed, #
# however. The namespace of the qualifiers can be diffe- #
# rent from the main namespace, but this is not yet taken #
# into account (TODO). #
# ------------------------------------------------------- #
# [qualif_item(N2)] := <rdf:li> #
# <rdf:Description> #
# <rdf:value>text</rdf:value> #
# [qualifier(N2)]* #
# </rdf:Description> #
# </rdf:li> #
# [qualifier(N2)] := <N2:role>text</N2:role> #
###########################################################
sub parse_rdf_item_qualified {
my ($this, $pdir) = @_; my ($name, $value) = ('qualified-ITEM');
# try to match structure and return on failure
return 0 unless $this->list_extract
([['OPEN','rdf:li'], ['OPEN','rdf:Description'], ['OPEN','rdf:value'],
['CONTENT', '(.*)', \$value], ['CLOSE', 'rdf:value']]);
# store the qualified property value, then all qualifiers;
# we need a new subdirectory to store all this stuff
$this->store_xmp_value([@$pdir, $name], 'ITEM', $value);
1 while $this->parse_rdf_simple_property('.*', [@$pdir, $name]);
# find where tags are closing
$this->list_extract([['CLOSE', 'rdf:Description'], ['CLOSE', 'rdf:li']])
|| $this->die('item_qualified: error at closing tag');
1 }
###########################################################
# Language alternatives: these are items inside an 'Alt' #
# array properties. It should not be possible to mix #
# language alternatives and normal items, but this is not #
# currently checked (TODO ?) #
# ------------------------------------------------------- #
# [lang_item] := <rdf:li xml:lang='...'>text</rdf:li> #
###########################################################
sub parse_rdf_item_lang {
my ($this, $pdir) = @_; my ($language, $content) = ();
# try to match structure and return on failure
return 0 unless $this->list_extract
([['OPEN', 'rdf:li'], ['ATTRIBUTE', 'xml:lang', '(.*)', \$language],
['CONTENT', '(.*)', \$content], ['CLOSE', 'rdf:li']]);
# store the property content
$this->store_xmp_value($pdir, $language, $content, 'lang-alt');
1 }
# successful load
1;
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