whatpm/Whatpm/RDFXML.pm

package Whatpm::RDFXML;
use strict;

## NOTE: EntityReference nodes are not supported except that
## unexpected entity reference are simply ignored.  (In fact
## all EntityRefernce nodes are ignored.)

my $RDF_URI = q<http://www.w3.org/1999/02/22-rdf-syntax-ns#>;

sub new ($) {
  my $self = bless {fact_level => 'm', grammer_level => 'm'}, shift;
  $self->{onerror} = sub {
    my %opt = @_;
    warn $opt{type}, "\n";
  };
  $self->{ontriple} = sub {
    my %opt = @_;
    my $dump_resource = sub {
      my $resource = shift;
      if ($resource->{uri}) {
        return '<' . $resource->{uri} . '>';
      } elsif ($resource->{bnodeid}) {
        return '_:' . $resource->{bnodeid};
      } elsif ($resource->{nodes}) {
        return '"' . join ('', map {$_->inner_html} @{$resource->{nodes}}) .
            '"^^<' . $resource->{datatype} . '>';
      } elsif (defined $resource->{value}) {
        return '"' . $resource->{value} . '"' .
            (defined $resource->{datatype}
                 ? '^^<' . $resource->{datatype} . '>'
                 : '@' . $resource->{language});
      } else {
        return '??';
      }
    };
    print STDERR $dump_resource->($opt{subject}) . ' ';
    print STDERR $dump_resource->($opt{predicate}) . ' ';
    print STDERR $dump_resource->($opt{object}) . "\n";
  };
  return $self;
} # new

sub convert_document ($$) {
  my $self = shift;
  my $node = shift; # Document

  ## ISSUE: An RDF/XML document, either |doc| or |nodeElement|
  ## is allowed as a starting production.  However, |nodeElement|
  ## is not a Root Event.

  my $has_element;

  for my $cn (@{$node->child_nodes}) {
    if ($cn->node_type == $cn->ELEMENT_NODE) {
      unless ($has_element) {
        if ($cn->manakai_expanded_uri eq $RDF_URI . q<RDF>) {
          $self->convert_rdf_element ($cn);
        } else {
          $self->convert_rdf_node_element ($cn);
        }
        $has_element = 1;
      } else {
        $self->{onerror}->(type => 'second node element',
                           level => $self->{grammer_level},
                           node => $cn);
      }
    } elsif ($cn->node_type == $cn->TEXT_NODE or
             $cn->node_type == $cn->CDATA_SECTION_NODE) {
      $self->{onerror}->(type => 'character not allowed',
                         level => $self->{grammer_level},
                         node => $cn);
    }
  }
} # convert_document

my $check_rdf_namespace = sub {
  my $self = shift;
  my $node = shift;
  my $node_nsuri = $node->namespace_uri;
  return unless defined $node_nsuri;
  if (substr ($node_nsuri, 0, length $RDF_URI) eq $RDF_URI and
      length $RDF_URI < length $node_nsuri) {
    $self->{onerror}->(type => 'bad rdf namespace',
                       level => $self->{fact_level}, # Section 5.1
                       node => $node);
  }
}; # $check_rdf_namespace

sub convert_rdf_element ($$) {
  my ($self, $node) = @_;

  $check_rdf_namespace->($self, $node);

  # |RDF|

  for my $attr (@{$node->attributes}) {
    my $prefix = $attr->prefix;
    if (defined $prefix) {
      next if $prefix =~ /^[Xx][Mm][Ll]/;
    } else {
      next if $attr->manakai_local_name =~ /^[Xx][Mm][Ll]/;
    }

    $check_rdf_namespace->($self, $attr);
    $self->{onerror}->(type => 'attribute not allowed',
                       level => $self->{grammer_level},
                       node => $attr);
  }

  # |nodeElementList|
  for my $cn (@{$node->child_nodes}) {
    if ($cn->node_type == $cn->ELEMENT_NODE) {
      $self->convert_node_element ($cn);
    } elsif ($cn->node_type == $cn->TEXT_NODE or
             $cn->node_type == $cn->CDATA_SECTION_NODE) {
      if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
        $self->{onerror}->(type => 'character not allowed',
                           level => $self->{grammer_level},
                           node => $cn);
      }
    }
  }
} # convert_rdf_element

my %coreSyntaxTerms = (
  $RDF_URI . 'RDF' => 1,
  $RDF_URI . 'ID' => 1,
  $RDF_URI . 'about' => 1,
  $RDF_URI . 'parseType' => 1,
  $RDF_URI . 'resource' => 1,
  $RDF_URI . 'nodeID' => 1,
  $RDF_URI . 'datatype' => 1,
);

my %oldTerms = (
  $RDF_URI . 'aboutEach' => 1,
  $RDF_URI . 'aboutEachPrefix' => 1,
  $RDF_URI . 'bagID' => 1,
);

sub convert_node_element ($$) {
  my ($self, $node) = @_;

  $check_rdf_namespace->($self, $node);

  # |nodeElement|

  my $xuri = $node->manakai_expanded_uri;

  if ({
    %coreSyntaxTerms,
    $RDF_URI . 'li' => 1,
    %oldTerms,
  }->{$xuri}) {
    $self->{onerror}->(type => 'element not allowed',
                       level => $self->{grammer_level},
                       node => $node);

    ## TODO: W3C RDF Validator: Continue validation, but triples that would
    ## be generated from the subtree are ignored.
  }

  my $subject;
  my $rdf_type_attr;
  my @prop_attr;

  for my $attr (@{$node->attributes}) {
    my $prefix = $attr->prefix;
    if (defined $prefix) {
      next if $prefix =~ /^[Xx][Mm][Ll]/;
    } else {
      next if $attr->manakai_local_name =~ /^[Xx][Mm][Ll]/;
    }

    $check_rdf_namespace->($self, $attr);

    my $attr_xuri = $attr->manakai_expanded_uri;
    if ($attr_xuri eq $RDF_URI . 'id') {
      unless (defined $subject) {
        $subject = {uri => '#' . $attr->value}; ## TODO: resolve()
      } else {
        ## TODO: Ignore triple as W3C RDF Validator does
      }
    } elsif ($attr_xuri eq $RDF_URI . 'nodeID') {
      unless (defined $subject) {
        $subject = {bnodeid => '## TODO: bnode: ' . $attr->value};
      } else {
        ## TODO: Ignore triple as W3C RDF Validator does
      }
    } elsif ($attr_xuri eq $RDF_URI . 'about') {
      unless (defined $subject) {
        $subject = {uri => $attr->value}; ## TODO: resolve
      } else {
        ## TODO: Ignore triple as W3C RDF Validator does
      }
    } elsif ($attr_xuri eq $RDF_URI . 'type') {
      $rdf_type_attr = $attr;
    } elsif ({
      %coreSyntaxTerms,
      $RDF_URI . 'li' => 1,
      $RDF_URI . 'Description' => 1,
      %oldTerms,
    }->{$attr_xuri}) {
      $self->{onerror}->(type => 'attribute not allowed',
                         level => $self->{grammer_level},
                         node => $attr);

      ## TODO: W3C RDF Validator: Ignore triples
    } else {
      push @prop_attr, $attr;
    }
  }
  
  unless (defined $subject) {
    $subject = {bnodeid => '## TODO: new bnodeid'};
  }

  if ($xuri ne $RDF_URI . 'Description') {
    $self->{ontriple}->(subject => $subject,
                        predicate => {uri => $RDF_URI . 'type'},
                        object => {uri => $xuri});
  }

  if ($rdf_type_attr) {
    $self->{ontriple}->(subject => $subject,
                        predicate => {uri => $RDF_URI . 'type'},
                        object => {uri => $rdf_type_attr->value}); ## TODO: resolve
  }

  for my $attr (@prop_attr) {
    $self->{ontriple}->(subject => $subject,
                        predicate => {uri => $attr->manakai_expanded_uri},
                        object => {value => $attr->value}); ## TODO: language
    ## TODO: SHOULD in NFC
  }

  # |propertyEltList|

  my $li_counter = 1;
  for my $cn (@{$node->child_nodes}) {
    my $cn_type = $cn->node_type;
    if ($cn_type == $cn->ELEMENT_NODE) {
      $self->convert_property_element ($cn, li_counter => \$li_counter,
                                       subject => $subject);
    } elsif ($cn_type == $cn->TEXT_NODE or
             $cn_type == $cn->CDATA_SECTION_NODE) {
      if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
        $self->{onerror}->(type => 'character not allowed',
                           level => $self->{grammer_level},
                           node => $cn);
      }
    }
  }

  return $subject;
} # convert_node_element

sub convert_property_element ($$%) {
  my ($self, $node, %opt) = @_;
  
  $check_rdf_namespace->($self, $node);

  # |propertyElt|

  my $xuri = $node->manakai_expanded_uri;
  if ($xuri eq $RDF_URI . 'li') {
    $xuri = $RDF_URI . '_' . ${$opt{li_counter}}++;
  }

  if ({
       %coreSyntaxTerms,
       $RDF_URI . 'Description' => 1,
       %oldTerms,
      }->{$xuri}) {
    $self->{onerror}->(type => 'element not allowed',
                       level => $self->{grammer_level},
                       node => $node);
    ## TODO: RDF Validator?
  }

  my $id_attr;
  my $dt_attr;
  my $parse_attr;
  my $nodeid_attr;
  my $resource_attr;
  my @prop_attr;
  for my $attr (@{$node->attributes}) {
    my $prefix = $attr->prefix;
    if (defined $prefix) {
      next if $prefix =~ /^[Xx][Mm][Ll]/;
    } else {
      next if $attr->manakai_local_name =~ /^[Xx][Mm][Ll]/;
    }

    $check_rdf_namespace->($self, $attr);

    my $attr_xuri = $attr->manakai_expanded_uri;
    if ($attr_xuri eq $RDF_URI . 'ID') {
      $id_attr = $attr;
    } elsif ($attr_xuri eq $RDF_URI . 'datatype') {
      $dt_attr = $attr;
    } elsif ($attr_xuri eq $RDF_URI . 'parseType') {
      $parse_attr = $attr;
    } elsif ($attr_xuri eq $RDF_URI . 'resource') {
      $resource_attr = $attr;
    } elsif ($attr_xuri eq $RDF_URI . 'nodeID') {
      $nodeid_attr = $attr;
    } elsif ({
      %coreSyntaxTerms,
      $RDF_URI . 'li' => 1,
      $RDF_URI . 'Description' => 1,
      %oldTerms,
    }->{$attr_xuri}) {
      $self->{onerror}->(type => 'attribute not allowed',
                         level => $self->{grammer_level},
                         node => $attr);
      ## TODO: RDF Validator?
    } else {
      push @prop_attr, $attr;
    }
  }

  my $parse = $parse_attr ? $parse_attr->value : '';
  if ($parse eq 'Resource') {
    # |parseTypeResourcePropertyElt|

    for my $attr ($resource_attr, $nodeid_attr, $dt_attr) {
      $self->{onerror}->(type => 'attribute not allowed',
                         level => $self->{grammer_level},
                         node => $attr);
      ## TODO: RDF Validator?
    }
    
    my $object = {bnodeid => '## TODO: generate bnodeid'};
    $self->{ontriple}->(subject => $opt{subject},
                        predicate => {uri => $xuri},
                        object => $object);
    ## TODO: reification
    
    ## As if nodeElement

    # |propertyEltList|
    
    my $li_counter = 1;
    for my $cn (@{$node->child_nodes}) {
      my $cn_type = $cn->node_type;
      if ($cn_type == $cn->ELEMENT_NODE) {
        $self->convert_property_element ($cn, li_counter => \$li_counter,
                                         subject => $object);
      } elsif ($cn_type == $cn->TEXT_NODE or
               $cn_type == $cn->CDATA_SECTION_NODE) {
        if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
          $self->{onerror}->(type => 'character not allowed',
                             level => $self->{grammer_level},
                             node => $cn);
        }
      }
    }
  } elsif ($parse eq 'Collection') {
    # |parseTypeCollectionPropertyElt|

    for my $attr ($resource_attr, $nodeid_attr, $dt_attr) {
      $self->{onerror}->(type => 'attribute not allowed',
                         level => $self->{grammer_level},
                         node => $attr);
      ## TODO: RDF Validator?
    }
    
    # |nodeElementList|
    my @resource;
    for my $cn (@{$node->child_nodes}) {
      if ($cn->node_type == $cn->ELEMENT_NODE) {
        push @resource, [$self->convert_node_element ($cn),
                         {bnodeid => '## TODO: bnodeid generated'}];
      } elsif ($cn->node_type == $cn->TEXT_NODE or
               $cn->node_type == $cn->CDATA_SECTION_NODE) {
        if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
          $self->{onerror}->(type => 'character not allowed',
                             level => $self->{grammer_level},
                             node => $cn);
        }
      }
    }

    if (@resource) {
      $self->{ontriple}->(subject => $opt{subject},
                          predicate => {uri => $xuri},
                          object => $resource[0]->[1]);
    } else {
      $self->{ontriple}->(subject => $opt{subject},
                          predicate => {uri => $xuri},
                          object => {uri => $RDF_URI . 'nil'});
    }
    ## TODO: reification

    while (@resource) {
      my $resource = shift @resource;
      $self->{ontriple}->(subject => $resource->[1],
                          predicate => {uri => $RDF_URI . 'first'},
                          object => $resource->[0]);
      if (@resource) {
        $self->{ontriple}->(subject => $resource->[1],
                            predicate => {uri => $RDF_URI . 'rest'},
                            object => $resource[0]->[1]);
      } else {
        $self->{ontriple}->(subject => $resource->[1],
                            predicate => {uri => $RDF_URI . 'rest'},
                            object => {uri => $RDF_URI . 'nil'});
      }
    }
  } elsif ($parse_attr) {
    # |parseTypeLiteralPropertyElt|
    # |parseTypeOtherPropertyElt| ## TODO: What RDF Validator does?

    for my $attr ($resource_attr, $nodeid_attr, $dt_attr) {
      $self->{onerror}->(type => 'attribute not allowed',
                         level => $self->{grammer_level},
                         node => $attr);
      ## TODO: RDF Validator?
    }

    my $value = [@{$node->child_nodes}];
    ## TODO: Callback for validation
    ## TODO: Serialized form SHOULD be in NFC.
    
    $self->{ontriple}->(subject => $opt{subject},
                        predicate => {uri => $xuri},
                        object => {nodes => $value,
                                   datatype => $RDF_URI . 'XMLLiteral'});
    ## TODO: reification
  } else {
    my $mode = 'unknown';

    if ($dt_attr) {
      $mode = 'literal'; # |literalPropertyElt|
      ## TODO: What RDF Validator does for |< rdf:datatype><el/></>|?
    }
    ## TODO: What RDF Validator does for |< prop-attr><non-empty/></>|?
    
    my $node_element;
    my $text = '';
    for my $cn (@{$node->child_nodes}) {
      my $cn_type = $cn->node_type;
      if ($cn_type == $cn->ELEMENT_NODE) {
        unless ($node_element) {
          $node_element = $cn;
          if ({
               resource => 1, unknown => 1, 'literal-or-resource' => 1,
              }->{$mode}) {
            $mode = 'resource';
          } else {
            $self->{onerror}->(type => 'element not allowed',
                               level => $self->{grammer_level},
                               node => $cn);
            ## TODO: RDF Validator?
          }
        } else {
          ## TODO: What RDF Validator does?
          $self->{onerror}->(type => 'second node element',
                             level => $self->{grammer_level},
                             node => $cn);
        }
      } elsif ($cn_type == $cn->TEXT_NODE or
               $cn_type == $cn->CDATA_SECTION_NODE) {
        my $data = $cn->data;
        $text .= $data;
        if ($data =~ /[^\x09\x0A\x0D\x20]/) {
          if ({
               literal => 1, unknown => 1, 'literal-or-resource' => 1,
              }->{$mode}) {
            $mode = 'literal';
          } else {
            $self->{onerror}->(type => 'character not allowed',
                               level => $self->{grammer_level},
                               node => $cn);
            ## TODO: RDF Validator?
          }
        } else {
          if ($mode eq 'unknown') {
            $mode = 'literal-or-resource';
          } else {
            #
          }
        }
      }
    }
    
    if ($mode eq 'resource') {
      # |resourcePropertyElt|
      
      for my $attr (@prop_attr, $resource_attr, $nodeid_attr, $dt_attr) {
        $self->{onerror}->(type => 'attribute not allowed',
                           level => $self->{grammer_level},
                           node => $attr);
        ## TODO: RDF Validator?
      }
      
      my $object = $self->convert_node_element ($node_element);
      
      $self->{ontriple}->(subject => $opt{subject},
                          predicate => {uri => $xuri},
                          object => $object);

      ## TODO: reification
    } elsif ($mode eq 'literal' or $mode eq 'literal-or-resource') {
      # |literalPropertyElt|
      
      for my $attr (@prop_attr, $resource_attr, $nodeid_attr) {
        $self->{onerror}->(type => 'attribute not allowed',
                           level => $self->{grammer_level},
                           node => $attr);
        ## TODO: RDF Validator?
      }
      
      ## TODO: $text SHOULD be in NFC
      
      if ($dt_attr) {
        $self->{ontriple}->(subject => $opt{subject},
                            predicate => {uri => $xuri},
                            object => {value => $text,
                                       datatype => $dt_attr->value});
      } else {
        $self->{ontriple}->(subject => $opt{subject},
                            predicate => {uri => $xuri},
                            object => {value => $text,
                                       ## TODO: language
                                      });
      }

      ## TODO: reification
    } else {
      ## |emptyPropertyElt|

      for my $attr ($dt_attr) {
        $self->{onerror}->(type => 'attribute not allowed',
                           level => $self->{grammer_level},
                           node => $attr);
        ## TODO: RDF Validator?
      }
      
      if (not $resource_attr and not $nodeid_attr and not @prop_attr) {
        $self->{ontriple}->(subject => $opt{subject},
                            predicate => {uri => $xuri},
                            object => {value => '',
                                       ## TODO: language
                                      });
        
        ## TODO: reification
      } else {
        my $object;
        if ($resource_attr) {
          $object = {uri => $resource_attr->value}; ## TODO: resolve
        } elsif ($nodeid_attr) {
          $object = {bnodeid => $nodeid_attr->value};
        } else {
          $object = {bnodeid => '## TODO: generated bnodeid'};
        }
        
        for my $attr (@prop_attr) {
          my $attr_xuri = $attr->manakai_expanded_uri;
          if ($attr_xuri eq $RDF_URI . 'type') {
            $self->{ontriple}->(subject => $object,
                                predicate => {uri => $attr_xuri},
                                object => $attr->value); ## TODO: resolve
          } else {
            ## TODO: SHOULD be in NFC
            $self->{ontriple}->(subject => $object,
                                predicate => {uri => $attr_xuri},
                                object => {value => $attr->value,
                                           ## TODO: lang
                                          });
          }
        }

        $self->{ontriple}->(subject => $opt{subject},
                            predicate => {uri => $xuri},
                            object => $object);
        
        ## TODO: reification
      }
    }
  }
} # convert_property_element

1;

1	package Whatpm::RDFXML;
2	use strict;
3
4	## NOTE: EntityReference nodes are not supported except that
5	## unexpected entity reference are simply ignored. (In fact
6	## all EntityRefernce nodes are ignored.)
7
8	my $RDF_URI = q<http://www.w3.org/1999/02/22-rdf-syntax-ns#>;
9
10	sub new ($) {
11	my $self = bless {fact_level => 'm', grammer_level => 'm'}, shift;
12	$self->{onerror} = sub {
13	my %opt = @_;
14	warn $opt{type}, "\n";
15	};
16	$self->{ontriple} = sub {
17	my %opt = @_;
18	my $dump_resource = sub {
19	my $resource = shift;
20	if ($resource->{uri}) {
21	return '<' . $resource->{uri} . '>';
22	} elsif ($resource->{bnodeid}) {
23	return '_:' . $resource->{bnodeid};
24	} elsif ($resource->{nodes}) {
25	return '"' . join ('', map {$_->inner_html} @{$resource->{nodes}}) .
26	'"^^<' . $resource->{datatype} . '>';
27	} elsif (defined $resource->{value}) {
28	return '"' . $resource->{value} . '"' .
29	(defined $resource->{datatype}
30	? '^^<' . $resource->{datatype} . '>'
31	: '@' . $resource->{language});
32	} else {
33	return '??';
34	}
35	};
36	print STDERR $dump_resource->($opt{subject}) . ' ';
37	print STDERR $dump_resource->($opt{predicate}) . ' ';
38	print STDERR $dump_resource->($opt{object}) . "\n";
39	};
40	return $self;
41	} # new
42
43	sub convert_document ($$) {
44	my $self = shift;
45	my $node = shift; # Document
46
47	## ISSUE: An RDF/XML document, either \|doc\| or \|nodeElement\|
48	## is allowed as a starting production. However, \|nodeElement\|
49	## is not a Root Event.
50
51	my $has_element;
52
53	for my $cn (@{$node->child_nodes}) {
54	if ($cn->node_type == $cn->ELEMENT_NODE) {
55	unless ($has_element) {
56	if ($cn->manakai_expanded_uri eq $RDF_URI . q<RDF>) {
57	$self->convert_rdf_element ($cn);
58	} else {
59	$self->convert_rdf_node_element ($cn);
60	}
61	$has_element = 1;
62	} else {
63	$self->{onerror}->(type => 'second node element',
64	level => $self->{grammer_level},
65	node => $cn);
66	}
67	} elsif ($cn->node_type == $cn->TEXT_NODE or
68	$cn->node_type == $cn->CDATA_SECTION_NODE) {
69	$self->{onerror}->(type => 'character not allowed',
70	level => $self->{grammer_level},
71	node => $cn);
72	}
73	}
74	} # convert_document
75
76	my $check_rdf_namespace = sub {
77	my $self = shift;
78	my $node = shift;
79	my $node_nsuri = $node->namespace_uri;
80	return unless defined $node_nsuri;
81	if (substr ($node_nsuri, 0, length $RDF_URI) eq $RDF_URI and
82	length $RDF_URI < length $node_nsuri) {
83	$self->{onerror}->(type => 'bad rdf namespace',
84	level => $self->{fact_level}, # Section 5.1
85	node => $node);
86	}
87	}; # $check_rdf_namespace
88
89	sub convert_rdf_element ($$) {
90	my ($self, $node) = @_;
91
92	$check_rdf_namespace->($self, $node);
93
94	# \|RDF\|
95
96	for my $attr (@{$node->attributes}) {
97	my $prefix = $attr->prefix;
98	if (defined $prefix) {
99	next if $prefix =~ /^[Xx][Mm][Ll]/;
100	} else {
101	next if $attr->manakai_local_name =~ /^[Xx][Mm][Ll]/;
102	}
103
104	$check_rdf_namespace->($self, $attr);
105	$self->{onerror}->(type => 'attribute not allowed',
106	level => $self->{grammer_level},
107	node => $attr);
108	}
109
110	# \|nodeElementList\|
111	for my $cn (@{$node->child_nodes}) {
112	if ($cn->node_type == $cn->ELEMENT_NODE) {
113	$self->convert_node_element ($cn);
114	} elsif ($cn->node_type == $cn->TEXT_NODE or
115	$cn->node_type == $cn->CDATA_SECTION_NODE) {
116	if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
117	$self->{onerror}->(type => 'character not allowed',
118	level => $self->{grammer_level},
119	node => $cn);
120	}
121	}
122	}
123	} # convert_rdf_element
124
125	my %coreSyntaxTerms = (
126	$RDF_URI . 'RDF' => 1,
127	$RDF_URI . 'ID' => 1,
128	$RDF_URI . 'about' => 1,
129	$RDF_URI . 'parseType' => 1,
130	$RDF_URI . 'resource' => 1,
131	$RDF_URI . 'nodeID' => 1,
132	$RDF_URI . 'datatype' => 1,
133	);
134
135	my %oldTerms = (
136	$RDF_URI . 'aboutEach' => 1,
137	$RDF_URI . 'aboutEachPrefix' => 1,
138	$RDF_URI . 'bagID' => 1,
139	);
140
141	sub convert_node_element ($$) {
142	my ($self, $node) = @_;
143
144	$check_rdf_namespace->($self, $node);
145
146	# \|nodeElement\|
147
148	my $xuri = $node->manakai_expanded_uri;
149
150	if ({
151	%coreSyntaxTerms,
152	$RDF_URI . 'li' => 1,
153	%oldTerms,
154	}->{$xuri}) {
155	$self->{onerror}->(type => 'element not allowed',
156	level => $self->{grammer_level},
157	node => $node);
158
159	## TODO: W3C RDF Validator: Continue validation, but triples that would
160	## be generated from the subtree are ignored.
161	}
162
163	my $subject;
164	my $rdf_type_attr;
165	my @prop_attr;
166
167	for my $attr (@{$node->attributes}) {
168	my $prefix = $attr->prefix;
169	if (defined $prefix) {
170	next if $prefix =~ /^[Xx][Mm][Ll]/;
171	} else {
172	next if $attr->manakai_local_name =~ /^[Xx][Mm][Ll]/;
173	}
174
175	$check_rdf_namespace->($self, $attr);
176
177	my $attr_xuri = $attr->manakai_expanded_uri;
178	if ($attr_xuri eq $RDF_URI . 'id') {
179	unless (defined $subject) {
180	$subject = {uri => '#' . $attr->value}; ## TODO: resolve()
181	} else {
182	## TODO: Ignore triple as W3C RDF Validator does
183	}
184	} elsif ($attr_xuri eq $RDF_URI . 'nodeID') {
185	unless (defined $subject) {
186	$subject = {bnodeid => '## TODO: bnode: ' . $attr->value};
187	} else {
188	## TODO: Ignore triple as W3C RDF Validator does
189	}
190	} elsif ($attr_xuri eq $RDF_URI . 'about') {
191	unless (defined $subject) {
192	$subject = {uri => $attr->value}; ## TODO: resolve
193	} else {
194	## TODO: Ignore triple as W3C RDF Validator does
195	}
196	} elsif ($attr_xuri eq $RDF_URI . 'type') {
197	$rdf_type_attr = $attr;
198	} elsif ({
199	%coreSyntaxTerms,
200	$RDF_URI . 'li' => 1,
201	$RDF_URI . 'Description' => 1,
202	%oldTerms,
203	}->{$attr_xuri}) {
204	$self->{onerror}->(type => 'attribute not allowed',
205	level => $self->{grammer_level},
206	node => $attr);
207
208	## TODO: W3C RDF Validator: Ignore triples
209	} else {
210	push @prop_attr, $attr;
211	}
212	}
213
214	unless (defined $subject) {
215	$subject = {bnodeid => '## TODO: new bnodeid'};
216	}
217
218	if ($xuri ne $RDF_URI . 'Description') {
219	$self->{ontriple}->(subject => $subject,
220	predicate => {uri => $RDF_URI . 'type'},
221	object => {uri => $xuri});
222	}
223
224	if ($rdf_type_attr) {
225	$self->{ontriple}->(subject => $subject,
226	predicate => {uri => $RDF_URI . 'type'},
227	object => {uri => $rdf_type_attr->value}); ## TODO: resolve
228	}
229
230	for my $attr (@prop_attr) {
231	$self->{ontriple}->(subject => $subject,
232	predicate => {uri => $attr->manakai_expanded_uri},
233	object => {value => $attr->value}); ## TODO: language
234	## TODO: SHOULD in NFC
235	}
236
237	# \|propertyEltList\|
238
239	my $li_counter = 1;
240	for my $cn (@{$node->child_nodes}) {
241	my $cn_type = $cn->node_type;
242	if ($cn_type == $cn->ELEMENT_NODE) {
243	$self->convert_property_element ($cn, li_counter => \$li_counter,
244	subject => $subject);
245	} elsif ($cn_type == $cn->TEXT_NODE or
246	$cn_type == $cn->CDATA_SECTION_NODE) {
247	if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
248	$self->{onerror}->(type => 'character not allowed',
249	level => $self->{grammer_level},
250	node => $cn);
251	}
252	}
253	}
254
255	return $subject;
256	} # convert_node_element
257
258	sub convert_property_element ($$%) {
259	my ($self, $node, %opt) = @_;
260
261	$check_rdf_namespace->($self, $node);
262
263	# \|propertyElt\|
264
265	my $xuri = $node->manakai_expanded_uri;
266	if ($xuri eq $RDF_URI . 'li') {
267	$xuri = $RDF_URI . '_' . ${$opt{li_counter}}++;
268	}
269
270	if ({
271	%coreSyntaxTerms,
272	$RDF_URI . 'Description' => 1,
273	%oldTerms,
274	}->{$xuri}) {
275	$self->{onerror}->(type => 'element not allowed',
276	level => $self->{grammer_level},
277	node => $node);
278	## TODO: RDF Validator?
279	}
280
281	my $id_attr;
282	my $dt_attr;
283	my $parse_attr;
284	my $nodeid_attr;
285	my $resource_attr;
286	my @prop_attr;
287	for my $attr (@{$node->attributes}) {
288	my $prefix = $attr->prefix;
289	if (defined $prefix) {
290	next if $prefix =~ /^[Xx][Mm][Ll]/;
291	} else {
292	next if $attr->manakai_local_name =~ /^[Xx][Mm][Ll]/;
293	}
294
295	$check_rdf_namespace->($self, $attr);
296
297	my $attr_xuri = $attr->manakai_expanded_uri;
298	if ($attr_xuri eq $RDF_URI . 'ID') {
299	$id_attr = $attr;
300	} elsif ($attr_xuri eq $RDF_URI . 'datatype') {
301	$dt_attr = $attr;
302	} elsif ($attr_xuri eq $RDF_URI . 'parseType') {
303	$parse_attr = $attr;
304	} elsif ($attr_xuri eq $RDF_URI . 'resource') {
305	$resource_attr = $attr;
306	} elsif ($attr_xuri eq $RDF_URI . 'nodeID') {
307	$nodeid_attr = $attr;
308	} elsif ({
309	%coreSyntaxTerms,
310	$RDF_URI . 'li' => 1,
311	$RDF_URI . 'Description' => 1,
312	%oldTerms,
313	}->{$attr_xuri}) {
314	$self->{onerror}->(type => 'attribute not allowed',
315	level => $self->{grammer_level},
316	node => $attr);
317	## TODO: RDF Validator?
318	} else {
319	push @prop_attr, $attr;
320	}
321	}
322
323	my $parse = $parse_attr ? $parse_attr->value : '';
324	if ($parse eq 'Resource') {
325	# \|parseTypeResourcePropertyElt\|
326
327	for my $attr ($resource_attr, $nodeid_attr, $dt_attr) {
328	$self->{onerror}->(type => 'attribute not allowed',
329	level => $self->{grammer_level},
330	node => $attr);
331	## TODO: RDF Validator?
332	}
333
334	my $object = {bnodeid => '## TODO: generate bnodeid'};
335	$self->{ontriple}->(subject => $opt{subject},
336	predicate => {uri => $xuri},
337	object => $object);
338	## TODO: reification
339
340	## As if nodeElement
341
342	# \|propertyEltList\|
343
344	my $li_counter = 1;
345	for my $cn (@{$node->child_nodes}) {
346	my $cn_type = $cn->node_type;
347	if ($cn_type == $cn->ELEMENT_NODE) {
348	$self->convert_property_element ($cn, li_counter => \$li_counter,
349	subject => $object);
350	} elsif ($cn_type == $cn->TEXT_NODE or
351	$cn_type == $cn->CDATA_SECTION_NODE) {
352	if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
353	$self->{onerror}->(type => 'character not allowed',
354	level => $self->{grammer_level},
355	node => $cn);
356	}
357	}
358	}
359	} elsif ($parse eq 'Collection') {
360	# \|parseTypeCollectionPropertyElt\|
361
362	for my $attr ($resource_attr, $nodeid_attr, $dt_attr) {
363	$self->{onerror}->(type => 'attribute not allowed',
364	level => $self->{grammer_level},
365	node => $attr);
366	## TODO: RDF Validator?
367	}
368
369	# \|nodeElementList\|
370	my @resource;
371	for my $cn (@{$node->child_nodes}) {
372	if ($cn->node_type == $cn->ELEMENT_NODE) {
373	push @resource, [$self->convert_node_element ($cn),
374	{bnodeid => '## TODO: bnodeid generated'}];
375	} elsif ($cn->node_type == $cn->TEXT_NODE or
376	$cn->node_type == $cn->CDATA_SECTION_NODE) {
377	if ($cn->data =~ /[^\x09\x0A\x0D\x20]/) {
378	$self->{onerror}->(type => 'character not allowed',
379	level => $self->{grammer_level},
380	node => $cn);
381	}
382	}
383	}
384
385	if (@resource) {
386	$self->{ontriple}->(subject => $opt{subject},
387	predicate => {uri => $xuri},
388	object => $resource[0]->[1]);
389	} else {
390	$self->{ontriple}->(subject => $opt{subject},
391	predicate => {uri => $xuri},
392	object => {uri => $RDF_URI . 'nil'});
393	}
394	## TODO: reification
395
396	while (@resource) {
397	my $resource = shift @resource;
398	$self->{ontriple}->(subject => $resource->[1],
399	predicate => {uri => $RDF_URI . 'first'},
400	object => $resource->[0]);
401	if (@resource) {
402	$self->{ontriple}->(subject => $resource->[1],
403	predicate => {uri => $RDF_URI . 'rest'},
404	object => $resource[0]->[1]);
405	} else {
406	$self->{ontriple}->(subject => $resource->[1],
407	predicate => {uri => $RDF_URI . 'rest'},
408	object => {uri => $RDF_URI . 'nil'});
409	}
410	}
411	} elsif ($parse_attr) {
412	# \|parseTypeLiteralPropertyElt\|
413	# \|parseTypeOtherPropertyElt\| ## TODO: What RDF Validator does?
414
415	for my $attr ($resource_attr, $nodeid_attr, $dt_attr) {
416	$self->{onerror}->(type => 'attribute not allowed',
417	level => $self->{grammer_level},
418	node => $attr);
419	## TODO: RDF Validator?
420	}
421
422	my $value = [@{$node->child_nodes}];
423	## TODO: Callback for validation
424	## TODO: Serialized form SHOULD be in NFC.
425
426	$self->{ontriple}->(subject => $opt{subject},
427	predicate => {uri => $xuri},
428	object => {nodes => $value,
429	datatype => $RDF_URI . 'XMLLiteral'});
430	## TODO: reification
431	} else {
432	my $mode = 'unknown';
433
434	if ($dt_attr) {
435	$mode = 'literal'; # \|literalPropertyElt\|
436	## TODO: What RDF Validator does for \|< rdf:datatype><el/></>\|?
437	}
438	## TODO: What RDF Validator does for \|< prop-attr><non-empty/></>\|?
439
440	my $node_element;
441	my $text = '';
442	for my $cn (@{$node->child_nodes}) {
443	my $cn_type = $cn->node_type;
444	if ($cn_type == $cn->ELEMENT_NODE) {
445	unless ($node_element) {
446	$node_element = $cn;
447	if ({
448	resource => 1, unknown => 1, 'literal-or-resource' => 1,
449	}->{$mode}) {
450	$mode = 'resource';
451	} else {
452	$self->{onerror}->(type => 'element not allowed',
453	level => $self->{grammer_level},
454	node => $cn);
455	## TODO: RDF Validator?
456	}
457	} else {
458	## TODO: What RDF Validator does?
459	$self->{onerror}->(type => 'second node element',
460	level => $self->{grammer_level},
461	node => $cn);
462	}
463	} elsif ($cn_type == $cn->TEXT_NODE or
464	$cn_type == $cn->CDATA_SECTION_NODE) {
465	my $data = $cn->data;
466	$text .= $data;
467	if ($data =~ /[^\x09\x0A\x0D\x20]/) {
468	if ({
469	literal => 1, unknown => 1, 'literal-or-resource' => 1,
470	}->{$mode}) {
471	$mode = 'literal';
472	} else {
473	$self->{onerror}->(type => 'character not allowed',
474	level => $self->{grammer_level},
475	node => $cn);
476	## TODO: RDF Validator?
477	}
478	} else {
479	if ($mode eq 'unknown') {
480	$mode = 'literal-or-resource';
481	} else {
482	#
483	}
484	}
485	}
486	}
487
488	if ($mode eq 'resource') {
489	# \|resourcePropertyElt\|
490
491	for my $attr (@prop_attr, $resource_attr, $nodeid_attr, $dt_attr) {
492	$self->{onerror}->(type => 'attribute not allowed',
493	level => $self->{grammer_level},
494	node => $attr);
495	## TODO: RDF Validator?
496	}
497
498	my $object = $self->convert_node_element ($node_element);
499
500	$self->{ontriple}->(subject => $opt{subject},
501	predicate => {uri => $xuri},
502	object => $object);
503
504	## TODO: reification
505	} elsif ($mode eq 'literal' or $mode eq 'literal-or-resource') {
506	# \|literalPropertyElt\|
507
508	for my $attr (@prop_attr, $resource_attr, $nodeid_attr) {
509	$self->{onerror}->(type => 'attribute not allowed',
510	level => $self->{grammer_level},
511	node => $attr);
512	## TODO: RDF Validator?
513	}
514
515	## TODO: $text SHOULD be in NFC
516
517	if ($dt_attr) {
518	$self->{ontriple}->(subject => $opt{subject},
519	predicate => {uri => $xuri},
520	object => {value => $text,
521	datatype => $dt_attr->value});
522	} else {
523	$self->{ontriple}->(subject => $opt{subject},
524	predicate => {uri => $xuri},
525	object => {value => $text,
526	## TODO: language
527	});
528	}
529
530	## TODO: reification
531	} else {
532	## \|emptyPropertyElt\|
533
534	for my $attr ($dt_attr) {
535	$self->{onerror}->(type => 'attribute not allowed',
536	level => $self->{grammer_level},
537	node => $attr);
538	## TODO: RDF Validator?
539	}
540
541	if (not $resource_attr and not $nodeid_attr and not @prop_attr) {
542	$self->{ontriple}->(subject => $opt{subject},
543	predicate => {uri => $xuri},
544	object => {value => '',
545	## TODO: language
546	});
547
548	## TODO: reification
549	} else {
550	my $object;
551	if ($resource_attr) {
552	$object = {uri => $resource_attr->value}; ## TODO: resolve
553	} elsif ($nodeid_attr) {
554	$object = {bnodeid => $nodeid_attr->value};
555	} else {
556	$object = {bnodeid => '## TODO: generated bnodeid'};
557	}
558
559	for my $attr (@prop_attr) {
560	my $attr_xuri = $attr->manakai_expanded_uri;
561	if ($attr_xuri eq $RDF_URI . 'type') {
562	$self->{ontriple}->(subject => $object,
563	predicate => {uri => $attr_xuri},
564	object => $attr->value); ## TODO: resolve
565	} else {
566	## TODO: SHOULD be in NFC
567	$self->{ontriple}->(subject => $object,
568	predicate => {uri => $attr_xuri},
569	object => {value => $attr->value,
570	## TODO: lang
571	});
572	}
573	}
574
575	$self->{ontriple}->(subject => $opt{subject},
576	predicate => {uri => $xuri},
577	object => $object);
578
579	## TODO: reification
580	}
581	}
582	}
583	} # convert_property_element
584
585	1;
586