[java]
/** Section 5.1.3.6 pag. 90,
* Set of constants which represent the Vocabulary of the ontology,
**/
package bookTrading.ontology;
public interface BookTradingVocabulary {
// VOCABULARY
public static final String BOOK = "Book";
public static final String BOOK_TITLE = "title";
public static final String BOOK_AUTHORS = "authors";
public static final String BOOK_EDITOR = "editor";
public static final String COSTS = "Costs";
public static final String COSTS_ITEM = "item";
public static final String COSTS_PRICE = "price";
public static final String SELL = "Sell";
public static final String SELL_ITEM = "item";
}</pre>
[/java]