code: public boolean hasNext()
  	{
  
  		try {
  			switch (modus) {
  			case INIT:
  				return queryArticle();
  
  			case ITERATE_WITH_MAPPING:
  				if (chronoIterator.hasNext()) {
  					return true;
  				}
  
  				reset();
  
  				if (resultArticles.next()) {
  
  					this.currentArticleID = resultArticles.getInt(1);
  					return (this.lastArticleID == -1)
  							|| (this.currentArticleID <= this.lastArticleID);
  				}
  
  				resultArticles.close();
  				return queryArticle();
  
  			case ITERATE_WITHOUT_MAPPING:
  
  				if (revisionIterator.hasNext()) {
  					return true;
  				}
  
  				reset();
  
  				if (resultArticles.next()) {
  
  					this.currentArticleID = resultArticles.getInt(1);
  					return (this.lastArticleID == -1)
  							|| (this.currentArticleID <= this.lastArticleID);
  				}
  
  				resultArticles.close();
  				return queryArticle();
  
  			default:
  				throw new RuntimeException("Illegal mode");
  			}
  
  		}
  		catch (SQLException e) {
  			throw new RuntimeException(e);
  		}
  	}
docs: Returns whether another revision is available or not.
  
  @return TRUE or FALSE