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Quick examples of using XML_GRDDL
Phase-Implementation, Featured
Updated Mar 22, 2008 by daniel.o...@gmail.com

I want RDF/XML from a document, and I want it now

Just want to crawl a document and be on your way?

XML_GRDDL_Driver::crawl($url) will perform all of the below steps and give you back merged RDF/XML 

/**
 * Example: Discover RDF/XML from Dan Connolly's w3 homepage.
 */
require_once 'XML/GRDDL.php';

$url = 'http://www.w3.org/People/Connolly/';

$grddl = XML_GRDDL::factory('Xsl');
try {
    var_dump($grddl->crawl($url));
} catch (Exception $e) {
    print $e->getMessage();
}

Find all GRDDL transformations

I have a document, and I want to see if it has GRDDL transformations anywhere.

I simply use XML_GRDDL_Driver::fetch($url) and XML_GRDDL_Driver::inspect($xml, $base_url) to do so. 

<?php
require_once 'XML/GRDDL.php';

/**
 * Example: Discover if there are any GRDDL transformations
 * from Dan Connolly's w3 homepage.
 */

$url = 'http://www.w3.org/People/Connolly/';

//Load a new GRDDL driver, using PHP's internal XSL extension
$grddl = XML_GRDDL::factory('Xsl');

//Retrieve the URL, using content negotiation
$xml = $grddl->fetch($url);

//Inspect the XML, and make sure we're aware of the baseURI
$stylesheets = $grddl->inspect($xml, $url);

print "Transformations available for " . $url . ":\n";
var_dump($stylesheets);

This produces a handy array of unique URLs. We should be able to follow these and get a useful XSLT file from them. 

Transformations available for http://www.w3.org/People/Connolly/:
array(4) {
  [0]=>
  string(40) "http://www.w3.org/2002/12/cal/glean-hcal"
  [1]=>
  string(63) "http://www.w3.org/2002/12/cal/../../../2006/vcard/hcard2rdf.xsl"
  [2]=>
  string(40) "http://purl.org/NET/erdf/extract-rdf.xsl"
  [4]=>
  string(44) "http://www.w3.org/2002/12/cal/glean-hcal.xsl"
}

Extract RDF/XML using a transformation

So, I've got my array of transformations, but how do I use them?

Simply do XML_GRDDL_Driver::transform($stylesheet_url, $xml); 

//Use those transformations
$rdf_xml = array();
foreach ($stylesheets as $stylesheet) {
    $rdf_xml[] = $grddl->transform($stylesheet, $xml);
}

foreach ($stylesheets as $n => $stylesheet) {
    print "Transformation " . $stylesheet . " produced:\n";
    print $rdf_xml[$n] . "\n\n";
}

This produces an RDF/XML document from each transformation. 

Transformation http://www.w3.org/2002/12/cal/glean-hcal produced:
<?xml version="1.0"?>
<r:RDF xmlns:r="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:c="http://www.w3.org/2002/12/cal/icaltzd#" xmlns:h="http://www.w3.org/1999/xhtml">
  <c:Vcalendar r:about="http://www.w3.org/People/Connolly/">
    <c:prodid>-//connolly.w3.org//RDF Calendar $Date: 2007/06/30 19:05:32 $ (BETA)//EN</c:prodid>
    <c:version>2.0</c:version>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#w3ctp200711">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C Technical
  Plenary Meetings</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-11-05</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-11-11</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2007/11/TPAC/"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Cambridge,
  MA</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6345">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C Video on the Web Workshop</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-12-12</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-12-14</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2007/08/video"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">San Jose, CA</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6768">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Tools of Change (TOC)</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-10</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-14</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6768"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">New York, NY</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#tag200802">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">TAG meeting</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-26</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-29</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2001/tag/#deliverables"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Vancouver</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#sxsw2008">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">SXSW Interactive</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-03-07</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-03-12</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://2008.sxsw.com/interactive/"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Austin,
  TX</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6432">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C AC meeting</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-04-20</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-04-23</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/Member/Meeting/"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Beijing, China</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6522">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">TAG ftf</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-19</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-22</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6522"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Bristol</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#semtech2008">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">SemTech
  Conference</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-18</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-23</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#semtech2008"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">San José</location>
        <status xmlns="http://www.w3.org/2002/12/cal/icaltzd#">declined</status>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6839">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Linked Data Planet</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-06-17</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-06-19</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6839"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Roosevelt Hotel, NY</location>
        <status xmlns="http://www.w3.org/2002/12/cal/icaltzd#">tentative</status>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6813">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">KM Australia 2008</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-07-21</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-07-24</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6813"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Melbourne Convention Centre, Australia</location>
      </c:Vevent>
    </c:component>
  </c:Vcalendar>
</r:RDF>


Transformation http://www.w3.org/2002/12/cal/../../../2006/vcard/hcard2rdf.xsl produced:
<?xml version="1.0" encoding="utf-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:v="http://www.w3.org/2006/vcard/ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:h="http://www.w3.org/1999/xhtml">
  <v:VCard>
    <v:logo rdf:resource="../../Icons/w3c_home.png"/>
    <v:fn>Dan Connolly</v:fn>
    <v:photo rdf:resource="9704/dan_c_thumb.jpg"/>
    <v:title>Research Scientist</v:title>
    <v:org rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Organization"/>
      <v:organization-name>MIT/CSAIL</v:organization-name>
    </v:org>
    <v:url rdf:resource="http://www.csail.mit.edu/"/>
    <v:email rdf:resource="mailto:connolly@w3.org"/>
    <v:adr rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Address"/>
      <v:extendedAddress>Room 32-G506</v:extendedAddress>
      <v:streetAddress>32 Vassar Street</v:streetAddress>
      <v:locality>Cambridge</v:locality>
      <v:region>MA</v:region>
      <v:postalCode>02139</v:postalCode>
      <v:countryName>USA</v:countryName>
    </v:adr>
    <v:geo rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Geo"/>
    </v:geo>
    <v:tel rdf:resource="tel:+1-617-395-0241"/>
    <v:url rdf:resource="irc://irc.freenode.net/DanC,isnick"/>
    <v:url rdf:resource="http://www.w3.org/People/Connolly/"/>
  </v:VCard>
  <v:VCard rdf:ID="mci">
    <v:fn>Kansas
    City International Airport</v:fn>
    <v:url rdf:resource="http://en.wikipedia.org/wiki/Kansas_City_International_Airport"/>
    <v:org rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Organization"/>
      <v:organization-name>Kansas
    City International Airport</v:organization-name>
    </v:org>
    <v:adr rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Address"/>
      <v:locality>Kansas
    City</v:locality>
    </v:adr>
    <v:geo rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Geo"/>
      <v:latitude>39.2975</v:latitude>
      <v:longitude>-94.7139</v:longitude>
    </v:geo>
  </v:VCard>
</rdf:RDF>


Transformation http://purl.org/NET/erdf/extract-rdf.xsl produced:
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:h="http://www.w3.org/1999/xhtml" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:doap="http://usefulinc.com/ns/doap#" xmlns:admin="http://webns.net/mvcb/">
  <rdf:Description rdf:about="">
    <admin:generatorAgent rdf:resource="http://purl.org/NET/erdf/extract"/>
  </rdf:Description>
  <rdf:Description rdf:about="">
    <created xmlns="http://purl.org/dc/terms/">1994-02</created>
    <versionInfo xmlns="http://www.w3.org/2002/07/owl#">$Revision: 1.532 $ of $Date: 2008/02/06 15:51:50 $</versionInfo>
    <modified xmlns="http://purl.org/dc/terms/">$Date: 2008/02/06 15:51:50 $</modified>
    <primaryTopic xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="#me" rdfs:label="Dan Connolly"/>
    <license xmlns="http://purl.org/dc/terms/" rdf:resource="http://www.w3.org/Consortium/Legal/2002/copyright-documents-20021231" rdfs:label="some rights reserved"/>
  </rdf:Description>
  <rdf:Description rdf:about="#travl"/>
  <rdf:Description rdf:about="#w3ctp200711"/>
  <rdf:Description rdf:about="#_6345"/>
  <rdf:Description rdf:about="#_6768"/>
  <rdf:Description rdf:about="#tag200802"/>
  <rdf:Description rdf:about="#sxsw2008"/>
  <rdf:Description rdf:about="#_6432"/>
  <rdf:Description rdf:about="#_6522"/>
  <rdf:Description rdf:about="#semtech2008"/>
  <rdf:Description rdf:about="#_6839"/>
  <rdf:Description rdf:about="#_6813"/>
  <rdf:Description rdf:about="#me">
    <name xmlns="http://xmlns.com/foaf/0.1/">Dan Connolly</name>
    <nick xmlns="http://xmlns.com/foaf/0.1/">DanC</nick>
    <mbox xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="mailto:connolly@w3.org" rdfs:label="connolly@w3.org"/>
    <homepage xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/People/Connolly/"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../html/wg/" rdfs:label="HTML WG"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../2001/tag/" rdfs:label="TAG"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2003/g/data-view" rdfs:label="GRDDL"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../2001/sw/grddl-wg/" rdfs:label="WG"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2002/12/cal/" rdfs:label="RDF Calendar"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2002/12/cal/" rdfs:label="RDF Calendar"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../QA/" rdfs:label="QA"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../2001/sw/DataAccess/" rdfs:label="DAWG/SPARQL"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2001/sw/interest/" rdfs:label="Semantic Web IG"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2004/OWL/" rdfs:label="OWL"/>
    <pastProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../MarkUp/html-spec/index.html" rdfs:label="HTML 2"/>
    <weblog xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/breadcrumbs/blog/2" rdfs:label="breadcrumbs"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2000/10/swap/doc/cwm" rdfs:label="cwm"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/DesignIssues/Notation3" rdfs:label="N3"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/2005/ajar/ajaw/Help" rdfs:label="tabulator"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.policyawareweb.org/" rdfs:label="PAW"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/TAMI/" rdfs:label="TAMI"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.microformats.org/" rdfs:label="microformats"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.advogato.org/person/connolly/" rdfs:label="open source"/>
    <weblog xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.advogato.org/person/connolly/" rdfs:label="open source"/>
    <seeAlso xmlns="http://www.w3.org/2000/01/rdf-schema#" rdf:resource="http://www.advogato.org/person/connolly/foaf.rdf"/>
    <openid xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="./"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dm93.org/" rdfs:label="family"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dm93.org/z2001/VolleyBallInKC" rdfs:label="volleyball"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dm93.org/z2001/ThreeChordsAndTheTruth" rdfs:label="guitar"/>
    <workplaceHomepage xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.csail.mit.edu/" rdfs:label="CSAIL"/>
    <currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/" rdfs:label="DIG"/>
    <workplaceHomepage xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../" rdfs:label="W3C"/>
    <pastProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/Protocols/" rdfs:label="HTTP"/>
    <pastProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/XML/" rdfs:label="XML"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://del.icio.us/connolly/w3c" rdfs:label="del.ici.ous links and notes"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2000/10/swap/doc/" rdfs:label="Semantic Web Tutorial Using N3"/>
    <interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2000/10/swap/pim/travel.html" rdfs:label="Semantic Web Travel&#10;    Tools"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/breadcrumbs/node/171" rdfs:label="Celebrating OWL interoperability and spec&#10;    quality"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2002/12/cal/mash/slides" rdfs:label="Semantic Web Data Integration with hCalendar and&#10;    GRDDL"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/TR/rdfcal/" rdfs:label="RDF Calendar - an application of the Resource&#10;    Description Framework to iCalendar Data"/>
    <made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www-mit.w3.org/2000/Talks/www9-larch/all.htm" rdfs:label="Specifying Web Architecture with Larch"/>
    <publications xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="pubs" rdfs:label="pubs/writings"/>
    <img xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="9704/dan_c_thumb.jpg" rdfs:label="Dan in 1997"/>
  </rdf:Description>
  <rdf:Description rdf:about="#me2">
    <based_near xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="#mci"/>
    <nick xmlns="http://xmlns.com/foaf/0.1/">DanC</nick>
    <sameAs xmlns="http://www.w3.org/2002/07/owl#" rdf:resource="#me"/>
  </rdf:Description>
  <rdf:Description rdf:about="#mci">
    <lat xmlns="http://www.w3.org/2003/01/geo/wgs84_pos#">39.2975</lat>
    <long xmlns="http://www.w3.org/2003/01/geo/wgs84_pos#">-94.7139</long>
  </rdf:Description>
  <rdf:Description rdf:about="http://feeds.technorati.com/events/http%3A//www.w3.org/People/Connolly/"/>
  <rdf:Description rdf:about="http://www.w3.org/2007/11/TPAC/"/>
  <rdf:Description rdf:about="http://www.w3.org/2007/08/video"/>
  <rdf:Description rdf:about="http://en.oreilly.com/toc2008/public/content/home"/>
  <rdf:Description rdf:about="http://en.wikipedia.org/wiki/Vancouver"/>
  <rdf:Description rdf:about="http://www.w3.org/2001/tag/#deliverables"/>
  <rdf:Description rdf:about="http://2008.sxsw.com/interactive/"/>
  <rdf:Description rdf:about="http://www.w3.org/Member/Meeting/"/>
  <rdf:Description rdf:about="http://www.w3.org/2001/tag/#deliverables"/>
  <rdf:Description rdf:about="http://www.linkeddataplanet.com/index.php"/>
  <rdf:Description rdf:about="http://www.kmaustralia.com/"/>
  <rdf:Description rdf:about="http://www2007.org/"/>
  <rdf:Description rdf:about="../../"/>
  <rdf:Description rdf:about="http://www.csail.mit.edu/"/>
  <rdf:Description rdf:about="mailto:connolly@w3.org"/>
  <rdf:Description rdf:about="http://maps.google.com/maps?f=q&amp;hl=en&amp;geocode=&amp;q=32+Vassar+Street,+02139&amp;sll=37.0625,-95.677068&amp;sspn=76.725149,106.523438&amp;ie=UTF8&amp;z=16&amp;iwloc=addr&amp;om=1"/>
  <rdf:Description rdf:about="http://www.csail.mit.edu/resources/maps/5G/G506.gif"/>
  <rdf:Description rdf:about="tel:+1-617-395-0241"/>
  <rdf:Description rdf:about="irc://irc.freenode.net/DanC,isnick"/>
  <rdf:Description rdf:about="http://www.w3.org/People/Connolly/"/>
  <rdf:Description rdf:about="http://technorati.com/contacts/http://www.w3.org/People/Connolly/"/>
  <rdf:Description rdf:about="../../"/>
  <rdf:Description rdf:about="http://en.wikipedia.org/wiki/Kansas_City_International_Airport">
    <primaryTopic xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="#mci"/>
  </rdf:Description>
  <rdf:Description rdf:about="/2000/10/swap/doc/">
    <title xmlns="http://purl.org/dc/elements/1.1/">Semantic Web Tutorial Using N3</title>
  </rdf:Description>
  <rdf:Description rdf:about="http://dig.csail.mit.edu/breadcrumbs/node/171">
    <title xmlns="http://purl.org/dc/elements/1.1/">Celebrating OWL interoperability and spec
    quality</title>
  </rdf:Description>
  <rdf:Description rdf:about="http://www.w3.org/2002/12/cal/mash/slides">
    <title xmlns="http://purl.org/dc/elements/1.1/">Semantic Web Data Integration with hCalendar and
    GRDDL</title>
  </rdf:Description>
  <rdf:Description rdf:about="http://www.w3.org/TR/rdfcal/">
    <title xmlns="http://purl.org/dc/elements/1.1/">RDF Calendar - an application of the Resource
    Description Framework to iCalendar Data</title>
  </rdf:Description>
  <rdf:Description rdf:about="http://www-mit.w3.org/2000/Talks/www9-larch/all.htm">
    <title xmlns="http://purl.org/dc/elements/1.1/">Specifying Web Architecture with Larch</title>
  </rdf:Description>
</rdf:RDF>

Merge one or more RDF/XML documents

So, we've got all of these fragments of RDF/XML to describe the page. I could put them individually into a triple store, but what if we want just one aggregate document?

This is where array_reduce() and XML_GRDDL_Driver::merge($xml1, $xml2) come in handy.

XML_GRDDL_Driver::merge($xml1, $xml2) will combine two XML documents, but since we've got more than that, we'll just keep repeating it. 

$result = array_reduce($rdf_xml, array($grddl, 'merge'));

print "The RDF/XML which extracted from " . $url . " is:\n";
print $result;

Produces: 

The RDF/XML which extracted from http://www.w3.org/People/Connolly/ is:
<?xml version="1.0"?>
<r:RDF xmlns:r="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:c="http://www.w3.org/2002/12/cal/icaltzd#" xmlns:h="http://www.w3.org/1999/xhtml">
  <c:Vcalendar r:about="http://www.w3.org/People/Connolly/">
    <c:prodid>-//connolly.w3.org//RDF Calendar $Date: 2007/06/30 19:05:32 $ (BETA)//EN</c:prodid>
    <c:version>2.0</c:version>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#w3ctp200711">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C Technical
  Plenary Meetings</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-11-05</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-11-11</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2007/11/TPAC/"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Cambridge,
  MA</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6345">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C Video on the Web Workshop</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-12-12</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-12-14</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2007/08/video"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">San Jose, CA</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6768">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Tools of Change (TOC)</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-10</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-14</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6768"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">New York, NY</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#tag200802">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">TAG meeting</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-26</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-29</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2001/tag/#deliverables"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Vancouver</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#sxsw2008">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">SXSW Interactive</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-03-07</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-03-12</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://2008.sxsw.com/interactive/"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Austin,
  TX</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6432">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C AC meeting</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-04-20</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-04-23</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/Member/Meeting/"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Beijing, China</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6522">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">TAG ftf</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-19</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-22</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6522"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Bristol</location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#semtech2008">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">SemTech
  Conference</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-18</dtstart>

        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-23</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#semtech2008"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">San Jos&#xE9;</location>
        <status xmlns="http://www.w3.org/2002/12/cal/icaltzd#">declined</status>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6839">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Linked Data Planet</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-06-17</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-06-19</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6839"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Roosevelt Hotel, NY</location>
        <status xmlns="http://www.w3.org/2002/12/cal/icaltzd#">tentative</status>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6813">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">KM Australia 2008</summary>
        <dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-07-21</dtstart>
        <dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-07-24</dtend>
        <url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6813"/>
        <location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Melbourne Convention Centre, Australia</location>
      </c:Vevent>
    </c:component>
  </c:Vcalendar>
  <v:VCard xmlns:v="http://www.w3.org/2006/vcard/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
    <v:logo rdf:resource="../../Icons/w3c_home.png"/>
    <v:fn>Dan Connolly</v:fn>
    <v:photo rdf:resource="9704/dan_c_thumb.jpg"/>
    <v:title>Research Scientist</v:title>
    <v:org rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Organization"/>
      <v:organization-name>MIT/CSAIL</v:organization-name>
    </v:org>
    <v:url rdf:resource="http://www.csail.mit.edu/"/>
    <v:email rdf:resource="mailto:connolly@w3.org"/>
    <v:adr rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Address"/>
      <v:extendedAddress>Room 32-G506</v:extendedAddress>
      <v:streetAddress>32 Vassar Street</v:streetAddress>
      <v:locality>Cambridge</v:locality>
      <v:region>MA</v:region>
      <v:postalCode>02139</v:postalCode>
      <v:countryName>USA</v:countryName>
    </v:adr>
    <v:geo rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Geo"/>
    </v:geo>
    <v:tel rdf:resource="tel:+1-617-395-0241"/>
    <v:url rdf:resource="irc://irc.freenode.net/DanC,isnick"/>
    <v:url rdf:resource="http://www.w3.org/People/Connolly/"/>
  </v:VCard>
  <v:VCard xmlns:v="http://www.w3.org/2006/vcard/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:ID="mci">
    <v:fn>Kansas
    City International Airport</v:fn>
    <v:url rdf:resource="http://en.wikipedia.org/wiki/Kansas_City_International_Airport"/>
    <v:org rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Organization"/>
      <v:organization-name>Kansas
    City International Airport</v:organization-name>
    </v:org>
    <v:adr rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Address"/>
      <v:locality>Kansas
    City</v:locality>
    </v:adr>
    <v:geo rdf:parseType="Resource">
      <rdf:type rdf:resource="http://www.w3.org/2006/vcard/ns#Geo"/>
      <v:latitude>39.2975</v:latitude>
      <v:longitude>-94.7139</v:longitude>
    </v:geo>
  </v:VCard>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:admin="http://webns.net/mvcb/" rdf:about="">
    <admin:generatorAgent rdf:resource="http://purl.org/NET/erdf/extract"/>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:default="http://purl.org/dc/terms/" xmlns:default1="http://www.w3.org/2002/07/owl#" xmlns:default2="http://xmlns.com/foaf/0.1/" rdf:about="">
    <default:created xmlns="http://purl.org/dc/terms/">1994-02</default:created>
    <default1:versionInfo xmlns="http://www.w3.org/2002/07/owl#">$Revision: 1.532 $ of $Date: 2008/02/06 15:51:50 $</default1:versionInfo>
    <default:modified xmlns="http://purl.org/dc/terms/">$Date: 2008/02/06 15:51:50 $</default:modified>
    <default2:primaryTopic xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="#me" rdfs:label="Dan Connolly"/>
    <default:license xmlns="http://purl.org/dc/terms/" rdf:resource="http://www.w3.org/Consortium/Legal/2002/copyright-documents-20021231" rdfs:label="some rights reserved"/>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#travl"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#w3ctp200711"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#_6345"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#_6768"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#tag200802"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#sxsw2008"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#_6432"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#_6522"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#semtech2008"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#_6839"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="#_6813"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:default="http://xmlns.com/foaf/0.1/" rdf:about="#me">
    <default:name xmlns="http://xmlns.com/foaf/0.1/">Dan Connolly</default:name>
    <default:nick xmlns="http://xmlns.com/foaf/0.1/">DanC</default:nick>
    <default:mbox xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="mailto:connolly@w3.org" rdfs:label="connolly@w3.org"/>
    <default:homepage xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/People/Connolly/"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../html/wg/" rdfs:label="HTML WG"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../2001/tag/" rdfs:label="TAG"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2003/g/data-view" rdfs:label="GRDDL"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../2001/sw/grddl-wg/" rdfs:label="WG"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2002/12/cal/" rdfs:label="RDF Calendar"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2002/12/cal/" rdfs:label="RDF Calendar"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../QA/" rdfs:label="QA"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../2001/sw/DataAccess/" rdfs:label="DAWG/SPARQL"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2001/sw/interest/" rdfs:label="Semantic Web IG"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2004/OWL/" rdfs:label="OWL"/>
    <default:pastProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../MarkUp/html-spec/index.html" rdfs:label="HTML 2"/>
    <default:weblog xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/breadcrumbs/blog/2" rdfs:label="breadcrumbs"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2000/10/swap/doc/cwm" rdfs:label="cwm"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/DesignIssues/Notation3" rdfs:label="N3"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/2005/ajar/ajaw/Help" rdfs:label="tabulator"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.policyawareweb.org/" rdfs:label="PAW"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/TAMI/" rdfs:label="TAMI"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.microformats.org/" rdfs:label="microformats"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.advogato.org/person/connolly/" rdfs:label="open source"/>
    <default:weblog xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.advogato.org/person/connolly/" rdfs:label="open source"/>
    <rdfs:seeAlso xmlns="http://www.w3.org/2000/01/rdf-schema#" rdf:resource="http://www.advogato.org/person/connolly/foaf.rdf"/>
    <default:openid xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="./"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dm93.org/" rdfs:label="family"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dm93.org/z2001/VolleyBallInKC" rdfs:label="volleyball"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dm93.org/z2001/ThreeChordsAndTheTruth" rdfs:label="guitar"/>
    <default:workplaceHomepage xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.csail.mit.edu/" rdfs:label="CSAIL"/>
    <default:currentProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/" rdfs:label="DIG"/>
    <default:workplaceHomepage xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="../../" rdfs:label="W3C"/>
    <default:pastProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/Protocols/" rdfs:label="HTTP"/>
    <default:pastProject xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/XML/" rdfs:label="XML"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://del.icio.us/connolly/w3c" rdfs:label="del.ici.ous links and notes"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2000/10/swap/doc/" rdfs:label="Semantic Web Tutorial Using N3"/>
    <default:interest xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="/2000/10/swap/pim/travel.html" rdfs:label="Semantic Web Travel&#10;    Tools"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://dig.csail.mit.edu/breadcrumbs/node/171" rdfs:label="Celebrating OWL interoperability and spec&#10;    quality"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/2002/12/cal/mash/slides" rdfs:label="Semantic Web Data Integration with hCalendar and&#10;    GRDDL"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www.w3.org/TR/rdfcal/" rdfs:label="RDF Calendar - an application of the Resource&#10;    Description Framework to iCalendar Data"/>
    <default:made xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="http://www-mit.w3.org/2000/Talks/www9-larch/all.htm" rdfs:label="Specifying Web Architecture with Larch"/>
    <default:publications xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="pubs" rdfs:label="pubs/writings"/>
    <default:img xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="9704/dan_c_thumb.jpg" rdfs:label="Dan in 1997"/>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://xmlns.com/foaf/0.1/" xmlns:default1="http://www.w3.org/2002/07/owl#" rdf:about="#me2">
    <default:based_near xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="#mci"/>
    <default:nick xmlns="http://xmlns.com/foaf/0.1/">DanC</default:nick>
    <default1:sameAs xmlns="http://www.w3.org/2002/07/owl#" rdf:resource="#me"/>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://www.w3.org/2003/01/geo/wgs84_pos#" rdf:about="#mci">
    <default:lat xmlns="http://www.w3.org/2003/01/geo/wgs84_pos#">39.2975</default:lat>
    <default:long xmlns="http://www.w3.org/2003/01/geo/wgs84_pos#">-94.7139</default:long>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://feeds.technorati.com/events/http%3A//www.w3.org/People/Connolly/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.w3.org/2007/11/TPAC/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.w3.org/2007/08/video"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://en.oreilly.com/toc2008/public/content/home"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://en.wikipedia.org/wiki/Vancouver"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.w3.org/2001/tag/#deliverables"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://2008.sxsw.com/interactive/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.w3.org/Member/Meeting/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.w3.org/2001/tag/#deliverables"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.linkeddataplanet.com/index.php"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.kmaustralia.com/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www2007.org/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="../../"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.csail.mit.edu/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="mailto:connolly@w3.org"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://maps.google.com/maps?f=q&amp;hl=en&amp;geocode=&amp;q=32+Vassar+Street,+02139&amp;sll=37.0625,-95.677068&amp;sspn=76.725149,106.523438&amp;ie=UTF8&amp;z=16&amp;iwloc=addr&amp;om=1"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.csail.mit.edu/resources/maps/5G/G506.gif"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="tel:+1-617-395-0241"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="irc://irc.freenode.net/DanC,isnick"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://www.w3.org/People/Connolly/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="http://technorati.com/contacts/http://www.w3.org/People/Connolly/"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" rdf:about="../../"/>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://xmlns.com/foaf/0.1/" rdf:about="http://en.wikipedia.org/wiki/Kansas_City_International_Airport">
    <default:primaryTopic xmlns="http://xmlns.com/foaf/0.1/" rdf:resource="#mci"/>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://purl.org/dc/elements/1.1/" rdf:about="/2000/10/swap/doc/">
    <default:title xmlns="http://purl.org/dc/elements/1.1/">Semantic Web Tutorial Using N3</default:title>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://purl.org/dc/elements/1.1/" rdf:about="http://dig.csail.mit.edu/breadcrumbs/node/171">
    <default:title xmlns="http://purl.org/dc/elements/1.1/">Celebrating OWL interoperability and spec
    quality</default:title>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://purl.org/dc/elements/1.1/" rdf:about="http://www.w3.org/2002/12/cal/mash/slides">
    <default:title xmlns="http://purl.org/dc/elements/1.1/">Semantic Web Data Integration with hCalendar and
    GRDDL</default:title>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://purl.org/dc/elements/1.1/" rdf:about="http://www.w3.org/TR/rdfcal/">
    <default:title xmlns="http://purl.org/dc/elements/1.1/">RDF Calendar - an application of the Resource
    Description Framework to iCalendar Data</default:title>
  </rdf:Description>
  <rdf:Description xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:default="http://purl.org/dc/elements/1.1/" rdf:about="http://www-mit.w3.org/2000/Talks/www9-larch/all.htm">
    <default:title xmlns="http://purl.org/dc/elements/1.1/">Specifying Web Architecture with Larch</default:title>
  </rdf:Description>
  <c:Vcalendar r:about="http://www.w3.org/People/Connolly/">
    <c:prodid>-//connolly.w3.org//RDF Calendar $Date: 2007/06/30 19:05:32 $ (BETA)//EN</c:prodid>
    <c:version>2.0</c:version>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#w3ctp200711">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C Technical
  Plenary Meetings</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-11-05</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-11-11</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2007/11/TPAC/"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Cambridge,
  MA</c:location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6345">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C Video on the Web Workshop</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-12-12</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2007-12-14</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2007/08/video"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">San Jose, CA</c:location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6768">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Tools of Change (TOC)</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-10</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-14</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6768"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">New York, NY</c:location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#tag200802">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">TAG meeting</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-26</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-02-29</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/2001/tag/#deliverables"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Vancouver</c:location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#sxsw2008">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">SXSW Interactive</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-03-07</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-03-12</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://2008.sxsw.com/interactive/"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Austin,
  TX</c:location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6432">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">W3C AC meeting</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-04-20</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-04-23</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/Member/Meeting/"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Beijing, China</c:location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6522">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">TAG ftf</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-19</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-22</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6522"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Bristol</c:location>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#semtech2008">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">SemTech
  Conference</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-18</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-05-23</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#semtech2008"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">San Jos&#xE9;</c:location>
        <c:status xmlns="http://www.w3.org/2002/12/cal/icaltzd#">declined</c:status>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6839">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Linked Data Planet</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-06-17</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-06-19</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6839"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Roosevelt Hotel, NY</c:location>
        <c:status xmlns="http://www.w3.org/2002/12/cal/icaltzd#">tentative</c:status>
      </c:Vevent>
    </c:component>
    <c:component>
      <c:Vevent r:about="http://www.w3.org/People/Connolly/#_6813">
        <c:organizer r:resource="http://www.w3.org/People/Connolly/#me"/>
        <c:summary xmlns="http://www.w3.org/2002/12/cal/icaltzd#">KM Australia 2008</c:summary>
        <c:dtstart xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-07-21</c:dtstart>
        <c:dtend xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:datatype="http://www.w3.org/2001/XMLSchema#date">2008-07-24</c:dtend>
        <c:url xmlns="http://www.w3.org/2002/12/cal/icaltzd#" r:resource="http://www.w3.org/People/Connolly/#_6813"/>
        <c:location xmlns="http://www.w3.org/2002/12/cal/icaltzd#">Melbourne Convention Centre, Australia</c:location>
      </c:Vevent>
    </c:component>
  </c:Vcalendar>
</r:RDF>

Extract RDF from Flickr, LinkedIn, Last.fm & Upcoming microformats

Let's be realistic. The most popular places to get data from are also likely to be on the web 2.0 train, and have broken xhtml. They probably don't even have a 

<head profile="foo.html">
</head>

Never fear, you can easily force microformat profiles into a document. 

require_once 'XML/GRDDL.php';

/**
 * Example: Fetch multiple URLs about a specific user
 * and get useful information out.
 */
$urls = array();
$urls[0] = 'http://flickr.com/people/clockwerx/';
$urls[1] = 'http://www.linkedin.com/in/clockwerx';
$urls[2] = 'http://www.last.fm/user/CloCkWeRX/';
$urls[3] = 'http://clockwerx.blogspot.com/';

//For each URL, pretend it has these urls in <head profile="foo" />
//These look for hcard, hcalendar, etc.
$profiles[$urls[0]][] = 'http://www.w3.org/2002/12/cal/cardcaletc';
$profiles[$urls[1]][] = 'http://microformats.org/wiki/hresume-profile';
$profiles[$urls[1]][] = 'http://www.w3.org/2002/12/cal/cardcaletc';
$profiles[$urls[2]][] = 'http://www.w3.org/2002/12/cal/cardcaletc';
$profiles[$urls[3]][] = 'http://www.w3.org/2002/12/cal/cardcaletc';

//Set what kind of transformations we're interested in.


$options = XML_GRDDL::getDefaultOptions();
$options['quiet'] = true;

$grddl = XML_GRDDL::factory('xsl', $options);
$results = array();
foreach ($urls as $n => $url) {
    $data = $grddl->fetch($url);

    $data = $grddl->prettify($data);

    $modified_data = $grddl->appendProfiles($data, $profiles[$url]);

    $stylesheets = $grddl->inspect($modified_data, $url);

    $rdf_xml = array();
    foreach ($stylesheets as $stylesheet) {
        $rdf_xml[] = $grddl->transform($stylesheet, $modified_data);
    }

    $results[$url] = array_reduce($rdf_xml, array($grddl, 'merge'));
}

print "We scuttered " . count($urls) . " urls and found these results\n";
foreach ($results as $url => $rdf_xml) {
    print $url . "\n";
    print $rdf_xml . "\n\n";
}

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