/*
* Converts the Producer Object into an TriG String
* representation.
*/
private String convertProducer(Producer producer) {
StringBuffer result = new StringBuffer();
// First the uriref for the subject
result.append(Producer.getPrefixed(producer.getNr()));
result.append("\n");
// rdf:type
result.append(createTriplePO(RDF.prefixed("type"), BSBM.prefixed("Producer")));
// rdfs:label
result.append(createTriplePO(RDFS.prefixed("label"), createLiteral(producer.getLabel())));
// rdfs:comment
result.append(createTriplePO(RDFS.prefixed("comment"), createLiteral(producer.getComment())));
// foaf:homepage
result.append(createTriplePO(FOAF.prefixed("homepage"), createURIref(producer.getHomepage())));
// bsbm:country
result.append(
createTriplePO(
BSBM.prefixed("country"), createURIref(ISO3166.find(producer.getCountryCode()))));
// dc:publisher
result.append(
createTriplePO(DC.prefixed("publisher"), Producer.getPrefixed(producer.getPublisher())));
// dc:date
GregorianCalendar date = new GregorianCalendar();
date.setTimeInMillis(producer.getPublishDate());
String dateString = DateGenerator.formatDate(date);
result.append(
createTriplePOEnd(
DC.prefixed("date"), createDataTypeLiteral(dateString, XSD.prefixed("date"))));
return result.toString();
}