XQueryをためす 2 (FLWOR表現)

こちら（XQuery FLWOR Expressions）を参考に．

XML(document, bookstore)の生成はこちら．

  NSString* output= [document XMLStringWithOptions:(NSXMLNodePrettyPrint|NSXMLNodeCompactEmptyElement)];
  NSLog(@"%@", output);
  {
   NSArray *nodes= [bookstore objectsForXQuery:@"/bookstore/book[price>30]/title" error:NULL];
   NSLog(@"%d", [nodes count]);
   int i;
   for(i= 0;i<[nodes count];i++) {
    NSLog(@"%@", [[nodes objectAtIndex:i] XMLString]);
   }
  }
  {
   NSString *query= @"for $x in /bookstore/book where $x/price>30 order by $x/title return $x/title";
   NSArray *nodes= [bookstore objectsForXQuery:query error:NULL];
   NSLog(@"%d", [nodes count]);
   int i;
   for(i= 0;i<[nodes count];i++) {
    NSLog(@"%@", [[nodes objectAtIndex:i] XMLString]);
   }
  }

結果

> <?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
    <book category="COOKING">
        <title lang="en">Everyday Italian</title>
        <author>Giada De Laurentiis</author>
        <year>2005</year>
        <price>30.00</price>
    </book>
    <book category="CHILDREN">
        <title lang="en">Harry Potter</title>
        <author>J K. Rowling</author>
        <year>2005</year>
        <price>29.99</price>
    </book>
    <book category="WEB">
        <title lang="en">XQuery Kick Start</title>
        <author>James McGovern</author>
        <author>Per Bothner</author>
        <author>Kurt Cagle</author>
        <author>James Linn</author>
        <author>Vaidyanathan Nagarajan</author>
        <year>2003</year>
        <price>49.99</price>
    </book>
    <book category="WEB">
        <title lang="en">Learning XML</title>
        <author>Erik T. Ray</author>
        <year>2003</year>
        <price>39.95</price>
    </book>
</bookstore>
> 2
> <title lang="en">XQuery Kick Start</title>
> <title lang="en">Learning XML</title>
> 2
> <title lang="en">Learning XML</title>
> <title lang="en">XQuery Kick Start</title>