anchor.diff:   
     static convertXmlToSearchResults(String xml) {
       XmlElement tree = XML.parse(xml);
  -    var searchResults = new SearchResults(
  -        timestamp: tree.attributes['timestamp'],
  -        attribution: tree.attributes['attribution'],
  -        moreUrl: tree.attributes['more_url'],
  -        queryString: tree.attributes['querystring'],
  -        polygon: tree.attributes['polygon'] == "true" ? true : false
  -    );
       
       List places = new List<Place>();
       
  
positive.code: import "package:xml/xml.dart";
  
  
  class SearchResults {
    
    List<Place> places = new List<Place>();
  
    final String timestamp;
    
  
negative.code:   
    final bool polygon;
    
    /**
     * Creates a new [SearchResult] with given attributes.
     */
    SearchResults({ this.timestamp, this.attribution, this.moreUrl, this.queryString, this.polygon, this.places });
    
    String toString() {
      var string = new List();
  