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1 | <?php |
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2 | |||
3 | /** |
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4 | * File holding the SMWRDFXMLSerializer class that provides basic functions for |
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5 | * serialising OWL data in RDF/XML syntax. |
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6 | * |
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7 | * @ingroup SMW |
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8 | * |
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9 | * @author Markus Krötzsch |
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10 | */ |
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11 | |||
12 | /** |
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13 | * Class for serializing exported data (encoded as SMWExpData object) in |
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14 | * RDF/XML. |
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15 | * |
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16 | * @ingroup SMW |
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17 | */ |
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18 | class SMWRDFXMLSerializer extends SMWSerializer { |
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19 | /** |
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20 | * True if the $pre_ns_buffer contains the beginning of a namespace |
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21 | * declaration block to which further declarations for the current |
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22 | * context can be appended. |
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23 | */ |
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24 | protected $namespace_block_started; |
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25 | /** |
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26 | * True if the namespaces that are added at the current serialization stage |
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27 | * become global, i.e. remain available for all later contexts. This is the |
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28 | * case in RDF/XML only as long as the header has not been streamed to the |
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29 | * client (reflected herein by calling flushContent()). Later, namespaces |
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30 | * can only be added locally to individual elements, thus requiring them to |
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31 | * be re-added multiple times if used in many elements. |
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32 | */ |
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33 | protected $namespaces_are_global; |
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34 | |||
35 | 14 | public function clear() { |
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36 | 14 | parent::clear(); |
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37 | 14 | $this->namespaces_are_global = false; |
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38 | 14 | $this->namespace_block_started = false; |
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39 | 14 | } |
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40 | |||
41 | 14 | protected function serializeHeader() { |
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42 | 14 | $this->namespaces_are_global = true; |
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43 | 14 | $this->namespace_block_started = true; |
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44 | 14 | $this->pre_ns_buffer = |
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45 | "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" . |
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46 | "<!DOCTYPE rdf:RDF[\n" . |
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47 | 14 | "\t<!ENTITY rdf " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&rdf;' ) ) . ">\n" . |
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48 | 14 | "\t<!ENTITY rdfs " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&rdfs;' ) ) . ">\n" . |
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49 | 14 | "\t<!ENTITY owl " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&owl;' ) ) . ">\n" . |
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50 | 14 | "\t<!ENTITY swivt " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&swivt;' ) ) . ">\n" . |
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51 | // A note on "wiki": this namespace is crucial as a fallback when it would be illegal to start e.g. with a number. |
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52 | // In this case, one can always use wiki:... followed by "_" and possibly some namespace, since _ is legal as a first character. |
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53 | 14 | "\t<!ENTITY wiki " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&wiki;' ) ) . ">\n" . |
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54 | 14 | "\t<!ENTITY category " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&category;' ) ) . ">\n" . |
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55 | 14 | "\t<!ENTITY property " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&property;' ) ) . ">\n" . |
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56 | 14 | "\t<!ENTITY wikiurl " . $this->makeValueEntityString( SMWExporter::getInstance()->expandURI( '&wikiurl;' ) ) . ">\n" . |
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57 | 14 | "]>\n\n" . |
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58 | 14 | "<rdf:RDF\n" . |
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59 | 14 | "\txmlns:rdf=\"&rdf;\"\n" . |
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60 | 14 | "\txmlns:rdfs=\"&rdfs;\"\n" . |
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61 | 14 | "\txmlns:owl =\"&owl;\"\n" . |
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62 | 14 | "\txmlns:swivt=\"&swivt;\"\n" . |
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63 | 14 | "\txmlns:wiki=\"&wiki;\"\n" . |
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64 | 14 | "\txmlns:category=\"&category;\"\n" . |
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65 | 14 | "\txmlns:property=\"&property;\""; |
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66 | 14 | $this->global_namespaces = array( 'rdf' => true, 'rdfs' => true, 'owl' => true, 'swivt' => true, 'wiki' => true, 'property' => true, 'category' => true ); |
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67 | 14 | $this->post_ns_buffer .= ">\n\n"; |
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68 | 14 | } |
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69 | |||
70 | 14 | protected function serializeFooter() { |
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71 | 14 | $this->post_ns_buffer .= "\t<!-- Created by Semantic MediaWiki, https://www.semantic-mediawiki.org/ -->\n"; |
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72 | 14 | $this->post_ns_buffer .= '</rdf:RDF>'; |
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73 | 14 | } |
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74 | |||
75 | 14 | public function serializeDeclaration( $uri, $typename ) { |
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76 | 14 | $this->post_ns_buffer .= "\t<$typename rdf:about=\"$uri\" />\n"; |
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77 | 14 | } |
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78 | |||
79 | 14 | public function serializeExpData( SMWExpData $expData ) { |
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80 | 14 | $this->serializeNestedExpData( $expData, '' ); |
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81 | 14 | $this->serializeNamespaces(); |
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82 | 14 | if ( !$this->namespaces_are_global ) { |
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83 | 1 | $this->pre_ns_buffer .= $this->post_ns_buffer; |
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84 | 1 | $this->post_ns_buffer = ''; |
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85 | 1 | $this->namespace_block_started = false; |
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86 | } |
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87 | 14 | } |
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88 | |||
89 | 14 | public function flushContent() { |
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90 | 14 | $result = parent::flushContent(); |
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91 | 14 | $this->namespaces_are_global = false; // must not be done before calling the parent method (which may declare namespaces) |
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92 | 14 | $this->namespace_block_started = false; |
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93 | 14 | return $result; |
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94 | } |
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95 | |||
96 | 2 | protected function serializeNamespace( $shortname, $uri ) { |
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97 | 2 | if ( $this->namespaces_are_global ) { |
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98 | 2 | $this->global_namespaces[$shortname] = true; |
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99 | 2 | $this->pre_ns_buffer .= "\n\t"; |
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100 | } else { |
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101 | $this->pre_ns_buffer .= ' '; |
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102 | } |
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103 | 2 | $this->pre_ns_buffer .= "xmlns:$shortname=\"$uri\""; |
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104 | 2 | } |
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105 | |||
106 | /** |
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107 | * Serialize the given SMWExpData object, possibly recursively with |
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108 | * increased indentation. |
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109 | * |
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110 | * @param $expData SMWExpData containing the data to be serialised. |
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111 | * @param $indent string specifying a prefix for indentation (usually a sequence of tabs) |
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112 | */ |
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113 | 14 | protected function serializeNestedExpData( SMWExpData $expData, $indent ) { |
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114 | 14 | $this->recordDeclarationTypes( $expData ); |
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115 | |||
116 | 14 | $type = $expData->extractMainType()->getQName(); |
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117 | 14 | if ( !$this->namespace_block_started ) { // start new ns block |
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118 | 1 | $this->pre_ns_buffer .= "\t$indent<$type"; |
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119 | 1 | $this->namespace_block_started = true; |
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120 | } else { // continue running block |
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121 | 14 | $this->post_ns_buffer .= "\t$indent<$type"; |
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122 | } |
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123 | |||
124 | 14 | if ( ( $expData->getSubject() instanceof SMWExpResource ) && |
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125 | 14 | !$expData->getSubject()->isBlankNode() ) { |
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126 | 14 | $this->post_ns_buffer .= ' rdf:about="' . $expData->getSubject()->getUri() . '"'; |
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127 | } // else: blank node, no "rdf:about" |
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128 | |||
129 | 14 | if ( count( $expData->getProperties() ) == 0 ) { // nothing else to export |
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130 | $this->post_ns_buffer .= " />\n"; |
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131 | } else { // process data |
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132 | 14 | $this->post_ns_buffer .= ">\n"; |
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133 | |||
134 | 14 | foreach ( $expData->getProperties() as $property ) { |
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135 | 14 | $prop_decl_queued = false; |
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136 | 14 | $isClassTypeProp = $this->isOWLClassTypeProperty( $property ); |
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137 | |||
138 | 14 | foreach ( $expData->getValues( $property ) as $valueElement ) { |
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139 | 14 | $this->requireNamespace( $property->getNamespaceID(), $property->getNamespace() ); |
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140 | |||
141 | 14 | if ( $valueElement instanceof SMWExpLiteral ) { |
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142 | 14 | $prop_decl_type = SMW_SERIALIZER_DECL_APROP; |
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143 | 14 | $this->serializeExpLiteral( $property, $valueElement, "\t\t$indent" ); |
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144 | } elseif ( $valueElement instanceof SMWExpResource ) { |
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145 | 14 | $prop_decl_type = SMW_SERIALIZER_DECL_OPROP; |
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146 | 14 | $this->serializeExpResource( $property, $valueElement, "\t\t$indent", $isClassTypeProp ); |
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147 | } elseif ( $valueElement instanceof SMWExpData ) { |
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148 | 1 | $prop_decl_type = SMW_SERIALIZER_DECL_OPROP; |
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149 | |||
150 | 1 | $collection = $valueElement->getCollection(); |
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151 | 1 | if ( $collection !== false ) { // RDF-style collection (list) |
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152 | $this->serializeExpCollection( $property, $collection, "\t\t$indent", $isClassTypeProp ); |
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153 | 1 | } elseif ( count( $valueElement->getProperties() ) > 0 ) { // resource with data |
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154 | $this->post_ns_buffer .= "\t\t$indent<" . $property->getQName() . ">\n"; |
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155 | $this->serializeNestedExpData( $valueElement, "\t\t$indent" ); |
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156 | $this->post_ns_buffer .= "\t\t$indent</" . $property->getQName() . ">\n"; |
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157 | } else { // resource without data |
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158 | 1 | $this->serializeExpResource( $property, $valueElement->getSubject(), "\t\t$indent", $isClassTypeProp ); |
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159 | } |
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160 | } // else: no other types of export elements |
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161 | |||
162 | 14 | if ( !$prop_decl_queued ) { |
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163 | 14 | $this->requireDeclaration( $property, $prop_decl_type ); |
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164 | 14 | $prop_decl_queued = true; |
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165 | } |
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166 | } |
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167 | } |
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168 | 14 | $this->post_ns_buffer .= "\t$indent</" . $type . ">\n"; |
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169 | } |
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170 | 14 | } |
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171 | |||
172 | /** |
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173 | * Add to the output a serialization of a property assignment where an |
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174 | * SMWExpLiteral is the object. It is assumed that a suitable subject |
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175 | * block has already been openend. |
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176 | * |
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177 | * @param $expResourceProperty SMWExpNsResource the property to use |
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178 | * @param $expLiteral SMWExpLiteral the data value to use |
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179 | * @param $indent string specifying a prefix for indentation (usually a sequence of tabs) |
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180 | */ |
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181 | 14 | protected function serializeExpLiteral( SMWExpNsResource $expResourceProperty, SMWExpLiteral $expLiteral, $indent ) { |
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182 | 14 | $this->post_ns_buffer .= $indent . '<' . $expResourceProperty->getQName(); |
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183 | |||
184 | // https://www.w3.org/TR/rdf-syntax-grammar/#section-Syntax-languages |
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185 | // "... to indicate that the included content is in the given language. |
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186 | // Typed literals which includes XML literals are not affected by this |
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187 | // attribute. The most specific in-scope language present (if any) is |
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188 | // applied to property element string literal ..." |
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189 | 14 | if ( $expLiteral->getDatatype() !== '' && $expLiteral->getLang() !== '' ) { |
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190 | 1 | $this->post_ns_buffer .= ' xml:lang="' . $expLiteral->getLang() . '"'; |
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191 | 14 | } elseif ( $expLiteral->getDatatype() !== '' ) { |
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192 | 14 | $this->post_ns_buffer .= ' rdf:datatype="' . $expLiteral->getDatatype() . '"'; |
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193 | } |
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194 | |||
195 | 14 | $this->post_ns_buffer .= '>' . $this->makeAttributeValueString( $expLiteral->getLexicalForm() ); |
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196 | 14 | $this->post_ns_buffer .= '</' . $expResourceProperty->getQName() . ">\n"; |
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197 | 14 | } |
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198 | |||
199 | /** |
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200 | * Add to the output a serialization of a property assignment where an |
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201 | * SMWExpResource is the object. It is assumed that a suitable subject |
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202 | * block has already been openend. |
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203 | * |
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204 | * @param $expResourceProperty SMWExpNsResource the property to use |
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205 | * @param $expResource SMWExpResource the data value to use |
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206 | * @param $indent string specifying a prefix for indentation (usually a sequence of tabs) |
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207 | * @param $isClassTypeProp boolean whether the resource must be declared as a class |
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208 | */ |
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209 | 14 | protected function serializeExpResource( SMWExpNsResource $expResourceProperty, SMWExpResource $expResource, $indent, $isClassTypeProp ) { |
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210 | 14 | $this->post_ns_buffer .= $indent . '<' . $expResourceProperty->getQName(); |
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211 | 14 | if ( !$expResource->isBlankNode() ) { |
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212 | 14 | if ( ( $expResource instanceof SMWExpNsResource ) && ( $expResource->getNamespaceID() == 'wiki' ) ) { |
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213 | // very common case, reduce bandwidth |
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214 | 9 | $this->post_ns_buffer .= ' rdf:resource="&wiki;' . $expResource->getLocalName() . '"'; |
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215 | } else { |
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216 | 14 | $uriValue = $this->makeAttributeValueString( $expResource->getUri() ); |
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217 | 14 | $this->post_ns_buffer .= ' rdf:resource="' . $uriValue . '"'; |
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218 | } |
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219 | } |
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220 | 14 | $this->post_ns_buffer .= "/>\n"; |
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221 | 14 | if ( $isClassTypeProp ) { |
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222 | 5 | $this->requireDeclaration( $expResource, SMW_SERIALIZER_DECL_CLASS ); |
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223 | } |
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224 | 14 | } |
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225 | |||
226 | /** |
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227 | * Add a serialization of the given SMWExpResource to the output, |
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228 | * assuming that an opening property tag is alerady there. |
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229 | * |
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230 | * @param $expResourceProperty SMWExpNsResource the property to use |
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231 | * @param $expResource array of (SMWExpResource or SMWExpData) |
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232 | * @param $indent string specifying a prefix for indentation (usually a sequence of tabs) |
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233 | * @param $isClassTypeProp boolean whether the resource must be declared as a class |
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234 | * |
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235 | * @bug The $isClassTypeProp parameter is not properly taken into account. |
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236 | * @bug Individual resources are not serialised properly. |
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237 | */ |
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238 | protected function serializeExpCollection( SMWExpNsResource $expResourceProperty, array $collection, $indent, $isClassTypeProp ) { |
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239 | $this->post_ns_buffer .= $indent . '<' . $expResourceProperty->getQName() . " rdf:parseType=\"Collection\">\n"; |
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240 | foreach ( $collection as $expElement ) { |
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241 | if ( $expElement instanceof SMWExpData ) { |
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242 | $this->serializeNestedExpData( $expElement, $indent ); |
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243 | } else { |
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244 | // FIXME: the below is not the right thing to do here |
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245 | //$this->serializeExpResource( $expResourceProperty, $expElement, $indent ); |
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246 | } |
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247 | if ( $isClassTypeProp ) { |
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248 | // FIXME: $expResource is undefined |
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249 | //$this->requireDeclaration( $expResource, SMW_SERIALIZER_DECL_CLASS ); |
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250 | } |
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251 | } |
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252 | $this->post_ns_buffer .= "$indent</" . $expResourceProperty->getQName() . ">\n"; |
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253 | } |
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254 | |||
255 | /** |
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256 | * Escape a string in the special form that is required for values in |
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257 | * DTD entity declarations in XML. Namely, this require the percent sign |
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258 | * to be replaced. |
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259 | * |
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260 | * @param $string string to be escaped |
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261 | * @return string |
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262 | */ |
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263 | 14 | protected function makeValueEntityString( $string ) { |
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264 | 14 | return "'" . str_replace( '%', '%', $string ) . "'"; |
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265 | } |
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266 | |||
267 | /** |
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268 | * Escape a string as required for using it in XML attribute values. |
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269 | * |
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270 | * @param $string string to be escaped |
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271 | * @return string |
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272 | */ |
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273 | 14 | protected function makeAttributeValueString( $string ) { |
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274 | 14 | return str_replace( array( '&', '>', '<' ), array( '&', '>', '<' ), $string ); |
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275 | } |
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276 | |||
277 | } |
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278 |
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