| [12] | 1 | <?php
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| 2 | // ----------------------------------------------------------------------------------
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| 3 | // Class: RdfParser
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| 4 | // ----------------------------------------------------------------------------------
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| 5 |
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| 6 |
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| 7 | /**
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| 8 | * A GRDDLParser.
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| 9 | * This class extracts rdf data from xhtml documents. It uses the PHP xsltprocessor.
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| 10 | * Gleaning Resource Descriptions from Dialects of Languages (GRDDL):
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| 11 | * (http://www.w3.org/TR/grddl/)
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| 12 | *
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| 13 | * @version $Id: GRDDLParser.php 320 2006-11-21 09:38:51Z tgauss $
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| 14 | * @author Tobias Gauß <tobias.gauss@web.de>,
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| 15 | *
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| 16 | * @package syntax
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| 17 | * @access public
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| 18 | *
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| 19 | */
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| 20 | class GRDDLParser extends Object{
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| 21 |
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| 22 |
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| 23 | /**
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| 24 | * Document link
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| 25 | *
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| 26 | *
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| 27 | * @var String
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| 28 | * @access private
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| 29 | */
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| 30 | var $doclink;
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * Stylesheet link
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| 35 | *
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| 36 | *
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| 37 | * @var String[]
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| 38 | * @access private
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| 39 | */
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| 40 | var $stylelinks;
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| 41 |
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| 42 |
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| 43 | /**
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| 44 | * DomDocument
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| 45 | *
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| 46 | * @var DomDocument
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| 47 | * @access private
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| 48 | */
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| 49 | var $domdoc;
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| 50 |
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| 51 |
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| 52 | /**
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| 53 | * generates a MemModel and creates the DomDocument.
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| 54 | *
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| 55 | * @param String $doc
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| 56 | * @access public
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| 57 | * @return MemModel $model
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| 58 | */
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| 59 | function generateModel($doc){
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| 60 | $model = new MemModel();
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| 61 | $this->doclink=$doc;
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| 62 | $this->domdoc = new DomDocument;
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| 63 | $this->domdoc->load($doc);
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| 64 | $this->_getStyles();
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| 65 | $model = $this->_generateRDF();
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| 66 | return $model;
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| 67 | }
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| 68 |
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| 69 |
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| 70 | /**
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| 71 | * gets the used xsl stylesheets.
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| 72 | *
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| 73 | * @access private
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| 74 | */
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| 75 | function _getStyles(){
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| 76 | $link=$this->domdoc->getElementsByTagName('link');
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| 77 | $i=0;
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| 78 | while($link->item($i)!=''){
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| 79 | $item = $link->item($i);
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| 80 | if($item->getAttributeNode('rel')->value=='transformation'){
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| 81 | $temp = $item->getAttributeNode('href')->value;
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| 82 | if(substr($temp,0,1)=='/'){
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| 83 | $pos = strrpos($this->doclink,'/');
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| 84 | $part = substr($this->doclink,0,$pos);
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| 85 | $this->stylelink[]=$part.$temp;
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| 86 | }else{
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| 87 | $this->stylelink[]=$temp;
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| 88 | }
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| 89 | }
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| 90 | $i++;
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| 91 | }
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| 92 | }
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| 93 |
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| 94 | /*
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| 95 | * uses the PHP build in xslt processor to
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| 96 | * generate the RDF statements and uses the
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| 97 | * RDF- Parser to generate the model
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| 98 | *
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| 99 | * @access private
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| 100 | * @return MemModel $model
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| 101 | */
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| 102 | function _generateRDF(){
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| 103 | $model=new MemModel();
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| 104 | $model->setBaseURI($this->doclink);
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| 105 | $proc = new xsltprocessor;
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| 106 | include_once(RDFAPI_INCLUDE_DIR.PACKAGE_SYNTAX_RDF);
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| 107 | $pars=new RdfParser();
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| 108 | foreach($this->stylelink as $key => $value){
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| 109 | $xsl = new DomDocument;
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| 110 | $xsl->load($value);
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| 111 | $proc->importStyleSheet($xsl);
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| 112 | $model->addModel($pars->generateModel($proc->transformToXML($this->domdoc),$this->doclink));
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| 113 | }
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| 114 | return $model;
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| 115 | }
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| 116 |
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| 117 |
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| 118 |
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| 119 | }
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| 120 | ?> |
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