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Cocoa's New Tree-Based XML Parser

Volume Number: 21 (2005)
Issue Number: 6
Column Tag: Programming

Cocoa's New Tree-Based XML Parser

Using NSXML To Parse, Edit, And Write XML

by Jeff LaMarche


This is the first part of a (two-part) article showing how to use a few of the great new pieces of Cocoa functionality available to developers with the release of Tiger. The first--the focus of this article--is NSXML, a set of Cocoa classes that implement a robust tree-based XML parser that provides the ability to create and edit XML from scratch as well as from data contained in files and vended through web services.

The second new technology, which we'll concentrate on in the next installment, is Core Data, one of the most astoundingly wonderful bits of technology Apple has ever given to the Mac development community.

In this month's article, we'll build a small Cocoa application that will retrieve book information from Amazon's XML-based web service, parse the vended data into Cocoa objects, then let the user edit the data before saving it to an XML file on their local disk.

Next month, we'll use Core Data and Cocoa Bindings to make a version of the same application with more functionality that's easier to maintain and support, takes less time to build, and requires writing much less code.

It's important to note here that you must have Tiger and the Tiger development tools installed, since neither NSXML nor Core Data are available in earlier releases. So, fire up Xcode 2.0, create a new Cocoa Application project titled Amazon-XML and let's dive in.

The Data model

Our first step is to build our data model the traditional Cocoa way. We have to create Cocoa classes to hold our data. We'll also need to write code that will allow instances of our data model objects to be copied, compared, and persisted. Go ahead and create a new objective-C class called MTBook in your newly created project. Now give MTBook instance variables to hold our book data.

MTBook Instance Variable Declaration

We're going to store a subset of the data that Amazon's web service provides. The bibliography provides a reference to the Amazon SDK where you can find out more about their SDK and XML format. The last two instance variables do not come from Amazon, but rather are there to hold additional, user-provided information.

@interface MTBook : NSObject 
   NSString             *isbn;
   NSString             *title;
   NSString             *publisher;
   NSCalendarDate       *dateReleased;
   NSData               *coverImage;
   NSMutableArray       *authors;
   int                  salesRank;
   NSURL                *url;
   NSCalendarDate       *dateRead;
   NSString             *comment;

Of course, we need to add accessor and mutator methods for each of these variables, as well as code to initialize the object, copy it, persist it, restore it, compare it, and release its memory when it's deallocated. These aspects of building a data model are some of the very few tedious tasks in programming Cocoa. Next month you'll see that these tedious steps are no longer necessary thanks to Core Data. But let's not get ahead of ourselves.

These various methods are not shown in code listings; they are standard Cocoa tasks that have been written about extensively elsewhere. I used Kevin Callahan's handy Accessorizer program to automatically generate the accessors and mutators, then hand-coded the initializers as well as the other methods a data object needs, such as code to copy an instance, compare one instance to another, or to encode and decode an instance. The process of creating the MTBook class took a considerable amount of time, even though it's all very straightforward. If you don't feel like doing all those tedious tasks (and who would blame you?), feel free to copy MTBook from the issue CD.

You may be wondering why we would choose to store the cover image as an NSData instead of an NSImage. The simple reason is that NSImage will not necessarily preserve the original image data at the same size and resolution. To avoid re-compression and possible loss of image quality or resolution, we'll store the original JPEG data as retrieved.

Architecture of NSXML

NSXML's functionality is provided by a small collection of classes, only a couple of which you will need to use.

Figure 1. NSXML Class Diagram

Most developers will only ever need to interact with NSXMLNode, NSXMLElement, and NSXMLDocument, though some may use NSXMLDTD, and NSXMLDTDNode in their travels. Since our application is not concerned with creating DTDs and we are going to assume that Amazon's XML validates correctly, we only need to look at the first three:

NSXMLDocument represents an entire XML document as a Cocoa object;

NSXMLElement represent the various, nested nodes of an NSXMLDocument

NSXMLNode represent XML "nodes". Nodes can be just about any item in an XML document (including the document itself), and as a result, NSXMLNode is the parent class of both NSXMLDocument and NSXMLElement. Most methods you'll interact with will return an NSXMLNode.

Nodes can contain attributes and namespaces. An attribute is data stored within the node's opening XML tag using key-value coding and is generally used to store metadata about the node. A namespace is a special kind of attribute used to avoid name conflicts among elements and attributes. Most XML you'll encounter probably won't use namespaces or will use a single, standard namespace. As a practical matter, you can often ignore namespaces when parsing XML. Amazon's XML uses a single, standard W3C namespace, so we're going to ignore them from here on in.

In addition to attributes and namespaces, NSXMLNodes can contain child nodes. Its children can, themselves, contain child nodes (and so on). This nesting behavior gives XML a lot of its flexibility and power and is what makes a tree-based parser such a good choice for many situations.

We need to take note of two other boxes on this diagram above. One is the light green box on the far right that is titled (utils). We'll talk about that one shortly. The other is on the left side of the diagram and is titled NSXMLParser. The downside of a tree-based XML parser is that it uses a fair chunk of memory and is overkill for many situations (including ours, if it were a real application). NSXMLParser is a standalone class that implements an event-driven XML parser. It's easy to use and has a much smaller footprint than NSXML. NSXMLParser is beyond the scope of this article, but you should know it's there and use it when appropriate.

Handy Additions to NSXML

There is one thing that NSXML lacks that many other tree-based XML parsers offer: the ability to retrieve a child of a given node by its name. Since referring to children by name makes code much more readable, I've created a category on NSXMLNode that adds this functionality to NSXMLNode objects.

Listing 1: NSXMLNode-utils.m

NSXMLNode utilities

This category on NSXMLNode adds two bits of useful functionality to NSXMLNode. The first method allows retrieving a child node of a given name. The second converts all the children of a given node to their string values, allowing you to retrieve an array of a node's children with on call. You'll see how both of these are used later in the article.

@implementation NSXMLNode(utils)

- (NSXMLNode *)childNamed:(NSString *)name
   NSEnumerator *e = [[self children] objectEnumerator];
   NSXMLNode *node;
   while (node = [e nextObject]) 
      if ([[node name] isEqualToString:name])
         return node;
   return nil;

- (NSArray *)childrenAsStrings
   NSMutableArray *ret = [[NSMutableArray arrayWithCapacity:
      [[self children] count]] retain];
   NSEnumerator *e = [[self children] objectEnumerator];
   NSXMLNode *node;
   while (node = [e nextObject])
      [ret addObject:[node stringValue]];
   return [ret autorelease];

Building the Interface

The next step in building our application is to design the interface in Interface Builder. If you're comfortable with the basics of using Interface Builder and how to link them to outlets and actions in your code, feel free to skip ahead to the next section: Coding with NSXML.

We're going to build a relatively simple interface here, just enough to work with. First, we'll lay out our interface so that it has fields corresponding to each instance variable in our data model, along with a button to initiate the search, and another to save the revised XML to a file. Mine looks like this:

Figure 2. Our Window in Interface Builder

Next, we'll go to the Classes tab, right-click NSObject and create a subclass of NSObject which we'll call MTXMLAppDelegate. This new class will act as both our application delegate and as our main window's controller class. Control-drag from the File's Owner icon to the instance of MTXMLAppDelegate and bind it to the delegate outlet. While we're here, control-drag from the Authors table to MTXMLAppDelegate and link to the DataSource outlet.

Double-click on the MTXMLAppDelegate instance icon, which will open the object inspector where you can add outlets and actions. Add actions called doSearch:, and saveToXML:. Also add the outlets shown in Figure 3, which correspond to each of the user interface elements that we'll need access to in our code.

Figure 3. Outlets

Now control-drag from the Lookup button to the doSearch: outlet of MTXMLAppDelegate and repeat with the ISBN text field. Now control-drag from the Save button and bind to the saveToXML: outlet. If we were creating a real application where it was important to keep the data model synchronized with the interface in real-time, we would also have to have an additional method that was called when any of the other field values changed. I mention this only because real-time synchronization of the data model is yet another thing you get for free using Core Data. For our limited purposes, we'll simply update the model when the Save button is pressed.

We also need to link our application delegate's outlets to the various fields in our window, so control-drag from the MTXMLAppDelegate instance icon to each of the fields and bind to the corresponding outlet. Once that is done, we're ready to write some code. Go ahead and generate the source files for MTXMLAppDelegate, then go back to Xcode, open up MTXMLAppDelegate.h, and immediately following all the automatically generated IBOutlet variables generated, add an MTBook instance variable called book, and don't forget to include MTBook.h. Our doSearch: method is where we'll actually retrieve the XML data from Amazon and work with it. A stub implementation of this method has been generated for us, so we'll add our code there.

Coding with NSXML

As with most Cocoa classes, the NSXML classes have been designed to be easy to use and to insulate you from having to know too much about the inner workings of the class. To instantiate an NSXMLDocument based on data retrieved from a URL, you simply allocate as normal and then initialize the object using initWithContentsOfURL:options:error:. If you already have the XML in memory, you can initialize instead with initWithData:options:error: instead.

The root node is available from an NSXMLDocument by using the rootElement method. An array of the child nodes of any element can be retrieved using the children method of NSXMLNode, or you can request a specific child by name using the childNamed: method from our utils category. To get the string contents of a node - the value between the begin and end tags--simply call the stringValue method.

The easiest way to show how these various methods work is to show some code.

Listing 2: MTXMLAppDelegate.m


This method uses NSXML to parse the results of the XML data retrieved from an Amazon ISBN search then stores that data as an MTBook object.

- (IBAction)doSearch:(id)sender
   // More information about Amazon's XML web services is available from
   // Here, we're just setting up the Amazon URL based on our assigned developer token 
   // (assigned to us by Amazon) and the ISBN number entered by the user
NSString	*urlBase =
   NSString	*urlString = [NSString stringWithFormat:urlBase,
         [isbnTF stringValue];
   NSURL	*theURL = [NSURL URLWithString:urlString];

   // NSXML doesn't throw an exception on bad allocation, nor does it simply return a
   // nil. NSXML acts old-school in some ways; it wants a pointer to a variable which it
   // will populate with an error code if there's a problem
NSError	*err=nil;
   // Initialize our document with the XML data in our URL	

   NSXMLDocument *xmlDoc = [[NSXMLDocument alloc]

   // If we were doing proper error checking, we'd check the value of err here. We'll
   // skip it and simply check for xmlDoc == nil later. This method works fine if you 
   // don't intend to give the specifics of any problems encountered to the end user.
   // Get a reference to the root node
NSXMLNode *rootNode = [xmlDoc rootElement];
   // In case of an error, Amazon includes a node called ErrorMsg, its presence tells us
   // that an error happened not in parsing the XML, but rather on Amazon's side, so we
   // check for it
NSXMLNode *errorNode = [rootNode childNamed:@"ErrorMsg"];
   if (rootNode == nil || errorNode != nil)
// We'll provide an error message in the URL field, blank the others, then abort.
      // objectValue is a method that will give you the contents of a node as an 
      // NSObject, which will always be a string when first parsed from XML, 
      // but which might be another type of Cocoa object such as an NSCalendarDate 
      // if you created the NSXMLDocument programmatically as we'll do later.
      // NSXMLDocument is smart enough to automatically convert commonly used
      // objects to the correct W3C formatting when outputting them to XML
      [urlTF setStringValue:[errorNode stringValue]];
      [commentsTF setStringValue:@""];
      [coverImage setImage:nil];
      [isbnTF setStringValue:@""];
      [publisherTF setStringValue:@""];
      [salesRankTF setStringValue:@""];
      [titleTF setStringValue:@""];
      // If no error, the book information is contained in a node called Details, so we'll 
      // grab it. Though the method actually returns an NSXMLNode, we know that, as a 
      // child of a document, we'll actually get an NSXMLElement. We declare it as an
      // NSXMLElement to avoid casting it later

      NSXMLElement *detailsNode = [rootNode
      // Release memory from any prior book, and start with a fresh object
[book release];
      book = [[MTBook alloc] init];

      // Now set the fields of our data model from singleton child nodes
      // NSStrings are easy - we just call the stringValue method on the node
   [book setIsbn:
          [[detailsNode childNamed:@"Asin"] stringValue]];
      [book setTitle:
         [[detailsNode childNamed:@"ProductName"]
      [book setPublisher:
         [[detailsNode childNamed:@"Manufacturer"] 

      // Since we created this NSXMLDocument from parsed XML, we're going to get
      // NSStrings when we call objectValue, so dates, numbers, and others have 
      // to be manually converted from strings
[book setDateReleased:[NSCalendarDate
         childNamed:@"ReleaseDate"] stringValue]]];
      // Sales rank is a scalar value
      [book setSalesRank:[[[detailsNode
         childNamed:@"SalesRank"] stringValue] intValue]];
      // URL is stored as an attribute of the Details node, not as child element. The
      // syntax for getting attributes is slightly different than for  child elements
[book setUrl:[NSURL URLWithString:[[detailsNode 
         attributeForName:@"url"] stringValue]]];
      // The XML we retrieved doesn't have the cover image, but it does have a URL 

      NSURL *imageURL = [NSURL URLWithString:[[detailsNode 
         childNamed:@"ImageUrlLarge"] stringValue]];
      [book setCoverImage:[NSData 

      // Since there can be more than one author of a book, Authors are stored in a child 
      // list of nodes. Fortunately, we now have a handy method for reducing children to
      // an array of their string values thanks to our category on NSXMLNode

      NSXMLNode *authorsNode = [detailsNode 
      [book setAuthors:[NSMutableArray
         arrayWithArray:[authorsNode childrenAsStrings]]];
      // We'll default the date last read to today, just to be user friendly

      [book setDateRead:[NSCalendarDate date]];
      // Okay, now our data model is populated... but how do we make the interface 
      // reflect these changes? We call a method (next listing) that does it the traditional 
      // Cocoa way 

      [self updateInterface];

   // We allocated it, we're responsible for releasing it

   [xmlDoc release];

Okay, so doSearch: gets the data, parses it, and populates our model. There's a missing link, however, which is to make the user interface reflect our data model. That's handled in a method cryptically called updateInterface, which simply copies the various values from our data model into the corresponding fields of the user interface, another tedious but straightforward bit of code writing.

But wait a second. It's not as straightforward as it first appears; there is potentially more than one author, and we've chosen an NSTableView for displaying them to the user. We can't just give an NSTableView an array to display. We need a table data source! For our simple application, we'll just implement the three required table data source methods right in MTXMLAppDelegate (which we earlier specified as the tables' data source in Interface Builder, you may recall). We mention these tasks here, without showing the code, to give a point of comparison for next month's article where we'll use Core Data to eliminate most of these tedious, time-consuming aspects of building a Cocoa application.

Once we've taken care of updating the interfaces and implementing the table data source methods, we can compile and run our application. Type in the ISBN number from the back of a book you've got laying around, click Lookup, and it should automatically populate all of the fields except for date read and comments. If there's a problem with the ISBN, the error message will display in the lower left of the window.

Figure 4. The Compiled Application

Not much spit and polish, but it works! One task still remains, however, which is to write the code to save the data, with changes, to an XML file. Since we didn't retain the original data we retrieved from Amazon, we'll have to create XML from scratch.

Listing 3: MTXMLAppDelegate.m


This method creates a new NSXMLDocument, populates it with the data from the user interface, then generates an XML file on disk from that data.

- (IBAction)saveToXML:(id)sender

   // Every XML document needs a root element, so we create a root element, then use it
   // to create our new document
NSXMLElement *root = [[NSXMLElement alloc]
   NSXMLDocument *doc = [[NSXMLDocument alloc]
   [root release];
   // We'll store the source URL where metadata should be stored: as an attribute rather 
   // than as a child element
NSDictionary *attr = [NSDictionary
      dictionaryWithObject:[urlTF stringValue]
   [root setAttributesAsDictionary:attr];
   // Now we'll store the strings
[root addChild:[NSXMLElement elementWithName:@"Comment"
      stringValue:[commentsTF stringValue]]];
   [root addChild:[NSXMLElement elementWithName:@"Title"
      stringValue:[titleTF stringValue]]];
   [root addChild:[NSXMLElement elementWithName:@"Publisher"
      stringValue:[publisherTF stringValue]]];
   [root addChild:[NSXMLElement elementWithName:@"ISBN"
      stringValue:[isbnTF stringValue]]];
   // We could add the sales rank as a string, but we'll do it as a number to show how 
NSXMLElement *rank = [NSXMLElement
   [rank setObjectValue:[NSNumber numberWithInt:
      [salesRankTF intValue]]];
   [root addChild:rank];
   // Dates can go in either as string or as NSDate, we'll store them as NSDates
NSXMLElement *publishedDate = [NSXMLElement
   [publishedDate setObjectValue:
      [publishedDateDP dateValue]];
   [root addChild:publishedDate];
   NSXMLElement *readDate = [NSXMLElement
   [readDate setObjectValue:[lastReadDP dateValue]];
   [root addChild:readDate];

   // We'll store the image's binary data. Letting the user change the image is
   // beyond the scope of this article, so we'll just pull the image from our data model
   // object instead of the NSImageView. 
NSXMLElement *cover = [[NSXMLElement alloc]
   [cover setObjectValue:[book coverImage]];
   [root addChild:cover];

   // Up to now, we've used convenience class methods that return an autoreleased 
   // NSXMLElement. This time we allocated it ourselves to show how. Since 
   // we allocated it,  we have to release it. This way is more memory efficient because
   // the object is released right away without going into the autorelease pool. The 
   // downside is that we have to write more lines of code.

   [cover release];
   // Finally, the data in the author's table automatically gets updated in our data model
   // thanks to our table data source methods, so we'll pull this array right from the data 
   // model as well
NSXMLElement *authors = [NSXMLElement
   int i;
   for (i=0; i < [[book authors] count]; i++)
   // Since we're in a loop of unknown size, we'll be kind and not use the 
      // autorelease pool.
      NSXMLElement *author = [[NSXMLElement alloc] 
      [author setStringValue:
         [[book authors] objectAtIndex:i]];
      [authors addChild:author];
      [author release];
   [root addChild:authors];
   // At this point, all of our data is now contained in our NSXMLDocument. Let's write 
   // it to a file. The option NSXMLNodePrettyPrint tells it to use tabs and other 
   // whitespace to make the output file easier on human eyes. You can pass nil if you 
   // don't care how it looks
NSData *xmlData = 
      [doc XMLDataWithOptions:NSXMLNodePrettyPrint];
   // If this were a real app, we  would present a sheet and ask where to save. But this is a 
   // demo, so we're just going to dump the file onto the desktop.
[xmlData writeToFile:[@"~/Desktop/book.xml"
      stringByExpandingTildeInPath] atomically:YES];

   // Memory cleanup
   [doc release];

Now, let's compile and run again, plug in an ISBN and press the Save button. If all went according to plan, there will now be a file called book.xml on your desktop. Open this file up in a text editor or XML editor, and you should see our edited data as well-formed XML. Since we specified NSXMLNodePrettyPrint, it should appear in a human readable format with indents and line breaks, as you see in Figure 5 (although I've removed the binary image data from the XML in the screenshot).

Figure 5. Output XML

Bring It On Home

In this project, we've used NSXML to parse XML into Cocoa objects and to create XML from Cocoa objects. There's even more you can do with NSXML: You can delete nodes and edit nodes in place. You can create DTDs programmatically and validate existing XML against its DTD to make sure it conforms. From here, you should be able to figure out any XML-related task you need from Apple's developer documentation: NSXML is quite easy to use.

But speaking of "easy to use", you probably noticed that, in a few places, I mentioned certain aspects of building this Cocoa application that were not quite as developer-friendly as one would hope, such as creating data model classes and synchronizing the user interface with the data model? Well, have no fear! Next month, we're going to dive into an even more amazing new technology: Core Data. We're going to recreate this application with more functionality in less time by writing less code.


"Namespaces in XML". W3C. World Wide Web Consortium. 6 June 2005. <>

"Introduction to Tree-Based XML Programming Guide for Cocoa". Apple Developer Connection. Apple Computer, Inc. 6 June 2005. <>

Accessorizer. Kevin Callahan. 6 June 2005. <>

"Amazon Web Services Documentation". Amazon. 6 June 2005. <>

Jeff LaMarche wrote his first line of code in Applesoft Basic on a Bell & Howell Apple //e in 1980 and he's owned at least one Apple computer at all times since. Though he currently makes his living consulting in the Mac-unfriendly world of "Enterprise" software, his Macs remain his first and greatest computer love. You can reach him at


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Apple has Certified Refurbished 2017 13″ MacBook Airs available starting at $849. An Apple one-year warranty is included with each MacBook, and shipping is free: – 13″ 1.8GHz/8GB/128GB MacBook Air (... Read more

Jobs Board

*Apple* Genius - Technical Customer Service...
Job Description:Job SummaryAs a Genius at the Apple Store, you maintain customers' trust in Apple as the skilled technical customer service expert, Read more
Metadata Operations Specialist, *Apple* Med...
# Metadata Operations Specialist, Apple Media Products Job Number: 113387726 Santa Clara Valley, California, United States Posted: 08-Feb-2018 Weekly Hours: 40.00 Read more
*Apple* Retail - Multiple Positions - Apple,...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Data Scientist, *Apple* Ecosystem (AMP Anal...
# Data Scientist, Apple Ecosystem (AMP Analytics) Job Number: 113428728 Santa Clara Valley, California, United States Posted: 24-Jan-2018 Weekly Hours: 40.00 **Job Read more
*Apple* Professional Learning Specialist - A...
# Apple Professional Learning Specialist Job Number: 113456892 Englewood, NJ, New Jersey, United States Posted: 02-Feb-2018 Weekly Hours: 40.00 **Job Summary** The Read more
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