(Objective-C) XMP Array Property - Bag, Seq, or Alt

How to insert or update an XMP array property (bag, seq, or alt).

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#import <CkoXmp.h>
#import <CkoXml.h>
#import <CkoStringArray.h>

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoXmp *xmp = [[CkoXmp alloc] init];

// Load a JPG or TIF image file.
// Sample JPG's with XMP metadata may be found at:
// http://www.chilkatsoft.com/testData/xmp/sample1.jpg
// http://www.chilkatsoft.com/testData/xmp/sample2.jpg
// http://www.chilkatsoft.com/testData/xmp/sample3.jpg
BOOL success = [xmp LoadAppFile: @"sample1.jpg"];
if (success != YES) {
    NSLog(@"%@",xmp.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Num embedded XMP docs: ",[xmp.NumEmbedded intValue]);

// Assuming there is at least one, get the 1st.
// (There is typically never more than one, but theoretically it's possible.)
CkoXml *xml = 0;
xml = [xmp GetEmbedded: [NSNumber numberWithInt: 0]];
if (xmp.LastMethodSuccess == YES) {

    // Create an object to hold one or more string values.
    CkoStringArray *sa = [[CkoStringArray alloc] init];
    success = [sa Append: @"value_1"];
    success = [sa Append: @"value_2"];
    // ...

    success = [xmp AddArray: xml arrType: @"bag" propName: @"Iptc4xmpCore:Chilkat" values: sa];
    if (success != YES) {
        NSLog(@"%@",xmp.LastErrorText);
    }
    else {
        // Save the JPG.
        success = [xmp SaveAppFile: @"modified.jpg"];
        if (success != YES) {
            NSLog(@"%@",xmp.LastErrorText);
        }

    }

}
else {
    NSLog(@"%@",xmp.LastErrorText);
}