code: private boolean includeDocument(ItemDocument itemDocument) {
  		for (StatementGroup sg : itemDocument.getStatementGroups()) {
  			// "P19" is "place of birth" on Wikidata
  			if (!"P19".equals(sg.getProperty().getId())) {
  				continue;
  			}
  			for (Statement s : sg) {
  				if (s.getMainSnak() instanceof ValueSnak) {
  					Value v = s.getValue();
  					// "Q1731" is "Dresden" on Wikidata
  					if (v instanceof ItemIdValue
  							&& "Q1731".equals(((ItemIdValue) v).getId())) {
  						return true;
  					}
  				}
  			}
  		}
  		return false;
  	}
docs: Returns true if the given document should be included in the
  serialization.
  
  @param itemDocument
  the document to check
  @return true if the document should be serialized