(Objective-C) Insert XML into existing XML by calling InsertChildTreeAfter

Demonstrates how to insert an XML tree or subtree into another XML document using the InsertChildTreeAfter method.

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#import <CkoXml.h>

// Build the 1st XML document:
// <x1>
//     <a1>1</a1>
//     <a2>2</a2>
//     <a3>3</a3>
// </x1>

CkoXml *xml = [[CkoXml alloc] init];
xml.Tag = @"x1";
[xml UpdateChildContent: @"a1" value: @"1"];
[xml UpdateChildContent: @"a2" value: @"2"];
[xml UpdateChildContent: @"a3" value: @"3"];

// Build a 2nd XML document:

// <x2>
//   <b1>11</b1>
//   <b2>22</b2>
//   <b3>33</b3>
// </x2>

CkoXml *xml2 = [[CkoXml alloc] init];
xml2.Tag = @"x2";
[xml2 UpdateChildContent: @"b1" value: @"11"];
[xml2 UpdateChildContent: @"b2" value: @"22"];
[xml2 UpdateChildContent: @"b3" value: @"33"];

// We want to insert xml2 into xml to get this:

// <x1>
//     <a1>1</a1>
//     <x2>
//         <b1>11</b1>
//         <b2>22</b2>
//         <b3>33</b3>
//     </x2>
//     <a2>2</a2>
//     <a3>3</a3>
// </x1>

// Insert xml2 after "a1"

int index = [[xml TagIndex: @"a1"] intValue];
if (index < 0) {
    NSLog(@"%@",@"a1 not found.");
    return;
}

[xml InsertChildTreeAfter: [NSNumber numberWithInt: index] tree: xml2];

NSLog(@"%@",[xml GetXml]);

// The result is:

// <x1>
//     <a1>1</a1>
//     <x2>
//         <b1>11</b1>
//         <b2>22</b2>
//         <b3>33</b3>
//     </x2>
//     <a2>2</a2>
//     <a3>3</a3>
// </x1>

// Note: xml2 now points to the subtree within xml.
// For example, update "b3" and then see how it's updated within the merged document:
[xml2 UpdateChildContent: @"b3" value: @"33333333"];

NSLog(@"%@",[xml GetXml]);

// The result:

// <x1>
//     <a1>1</a1>
//     <x2>
//         <b1>11</b1>
//         <b2>22</b2>
//         <b3>33333333</b3>
//     </x2>
//     <a2>2</a2>
//     <a3>3</a3>
// </x1>