W3C home > Mailing lists > Public > public-lod@w3.org > September 2009

Re: data.gov now live with RDFa

From: Ed Summers <ehs@pobox.com>
Date: Tue, 1 Sep 2009 14:41:09 -0400
Message-ID: <f032cc060909011141q31898139o82d27136507a1c8b@mail.gmail.com>
To: rick <rick@rickmurphy.org>, public-lod@w3.org
Just catching up on some old email. Perhaps I'm being obtuse, but is
there still RDFa at

  http://www.data.gov

I don't seem to see any, and neither does the distiller:

  http://www.w3.org/2007/08/pyRdfa/extract?format=turtle&uri=http://www.data.gov

//Ed

On Thu, Aug 20, 2009 at 8:16 AM, Richard Cyganiak<richard@cyganiak.de> wrote:
> Rick,
>
> Toby already pointed out the issue with the dc: namespace.
>
> There's also this section:
>
> <div class="hometext" about="data.gov program" property="dc:description">
>  The purpose of Data.gov is to increase public access ...
> </div>
>
> The value of the @about attribute has to be a URI, and "data.gov program" is
> not a URI. Fixing it is easy, but depends on what exactly you want the data
> to say.
>
> 1. Maybe you want the text to be a description of the web page
> http://www.data.gov/. Similar to the dc:title, dc:creator and dc:publisher
> triples that are already present. In that case, you would want to use
> about="", which is a shortcut for about="http://www.data.gov/" because an
> empty URI will be treated as a relative URI, and therefore expands to the
> URI of the current document. But since about="" is the default anyway, you
> could just drop the attribute completely and still get the same triple.
>
> 2. Maybe you want to text to be a description of the "data.gov program", the
> government activity/entity, and not just a description of the particular web
> page. In that case, you would need to decide on a URI that you want to use
> for this entity. One easy option would be about="#program", which again is a
> relative URI and would expand to http://www.data.gov/#program. In that case,
> it would be nice to add some more triples about the program.
>
> The first option might be a bit more straightforward.
>
> Best,
> Richard
>
>
> On 19 Aug 2009, at 11:50, rick wrote:
>
>> Hello All:
>>
>> Just to give you a heads up the data.gov home page is now live with RDFa
>> tags.
>>
>> http://www.data.gov/
>>
>> The page has two triples. One about the page, one about the program. We
>> used this very simplistic approach to overcome any operational barriers and
>> develop experience in publishing RDFa tags.
>>
>> See below for source code that parses the triples. I used the INRIA GRDDL
>> transform.
>>
>> Have fun and I'll watch this list for feedback and such.
>>
>> --
>> Rick
>>
>> cell: 703-201-9129
>> web:  http://www.rickmurphy.org
>> blog: http://phaneron.rickmurphy.org
>>
>> > more RDFaConsumer.java
>> /**
>> * @(#)RDFaConsumer.java
>> * @author rick@rickmurphy.org
>> */
>>
>> package gov.data;
>>
>> /**
>> */
>>
>> import javax.xml.parsers.DocumentBuilder;
>> import javax.xml.parsers.DocumentBuilderFactory;
>> import javax.xml.parsers.FactoryConfigurationError;
>> import javax.xml.parsers.ParserConfigurationException;
>>
>> import org.xml.sax.SAXException;
>> import org.xml.sax.SAXParseException;
>>
>> import java.text.ParseException;
>>
>> import java.io.UnsupportedEncodingException;
>> import java.io.IOException;
>>
>> import org.w3c.dom.Document;
>> import org.w3c.dom.Node;
>> import org.w3c.dom.NodeList;
>> import org.w3c.dom.Element;
>>
>> import javax.xml.transform.Transformer;
>> import javax.xml.transform.TransformerFactory;
>> import javax.xml.transform.TransformerException;
>> import javax.xml.transform.TransformerConfigurationException;
>> import javax.xml.transform.dom.DOMSource;
>> import javax.xml.transform.stream.StreamResult;
>> import javax.xml.transform.stream.StreamSource;
>>
>>
>> import java.net.URL;
>>
>> public class RDFaConsumer{
>>
>>   private static String namespace;
>>
>>   /**
>>    */
>>   public RDFaConsumer(String uri){
>>
>>        try {
>>
>>            DocumentBuilderFactory factory =
>> DocumentBuilderFactory.newInstance();
>>           DocumentBuilder builder = factory.newDocumentBuilder();
>>            Document input = builder.parse(new URL(uri).toString());
>>            input.normalize();
>>
>>            DOMSource source = new DOMSource(input);
>>            StreamResult result = new StreamResult(System.out);
>>            StreamSource stylesheet = new StreamSource(new
>> URL("http://ns.inria.fr/grddl/
>> rdfa/2008/09/03/RDFa2RDFXML.xsl").toString());
>>
>>            // Use a Transformer for output
>>            TransformerFactory tFactory = TransformerFactory.newInstance();
>>            Transformer transformer = tFactory.newTransformer(stylesheet);
>>            transformer.transform(source, result);
>>
>>            // transform the dom into RDF/XML
>>            traverse(input);
>>
>>       } catch (SAXParseException spe) {
>>            System.out.println("sax parse ex: " + spe);
>>       } catch (SAXException sxe) {
>>            System.out.println("sax ex: " + sxe);
>>       } catch (ParserConfigurationException pce) {
>>            System.out.println("parser config ex: " + pce);
>>       }catch (UnsupportedEncodingException ude) {
>>            System.out.println("unsupported encoding ex: " + ude);
>>       } catch (IOException ioe) {
>>            System.out.println("io ex: " + ioe);
>>       } catch (TransformerConfigurationException tc) {
>>            System.out.println("transformer config ex: " + tc);
>>       } catch (TransformerException te) {
>>            System.out.println("trasnformer ex: " + te);
>>       }
>>
>>   }//RDFaConsumer
>>
>>   /**
>>    */
>>   public static void main(String[] args){
>>
>>        new RDFaConsumer(args[0]);
>>
>>   }//main
>>
>>   /**
>>    */
>>   public void traverse(Node node){
>>
>>       // is there anything to do?
>>       if (node == null) {
>>           return;
>>       }
>>
>>       int type = node.getNodeType();
>>       switch (type) {
>>        case Node.DOCUMENT_NODE: {;
>>               Document document = (Document)node;
>>               traverse(document.getDocumentElement());
>>               break;
>>        }
>>
>>        case Node.ELEMENT_NODE: {
>>
>>            if(node.getNodeName().equals("")){
>>
>>                NodeList childNodes = node.getChildNodes();
>>
>>                break;
>>
>>            }
>>        }
>>
>>        case Node.ENTITY_REFERENCE_NODE: {
>>            Node child = node.getFirstChild();
>>            while (child != null) {
>>                traverse(child);
>>                child = child.getNextSibling();
>>            }
>>            break;
>>        }
>>
>>        case Node.CDATA_SECTION_NODE: {
>>
>>            // no work here
>>            break;
>>        }
>>
>>        }
>>
>>   }//traverse
>>
>>   /**
>>    */
>>   public void getRDFaHTML(){}//getRDFaHTML
>>
>> }//RDFaConsumer
>>
>>
>>
>
>
>
Received on Tuesday, 1 September 2009 18:41:49 UTC

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