(Objective-C) Find XML Element where Attribute = Value

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Finds an XML element at a particular location where an attribute has a specified value.

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#import <CkoXml.h>
#import <NSString.h>

// We have the following XML and wish to find the value of the time attribute where msg = "alert-from".

// <cdr id="4e5d3e7f41bf6201ad81000c29703270" e164="6207">
//     <user>
//         <grp name="wfln" mode="active"/>
//     </user>
//     <event msg="setup-to" time="287069" e164="5034"/>
//     <event msg="alert-from" time="287069" e164="5034"/>
//     <event msg="rel-to" time="287079" e164="5034"/>
// </cdr>

BOOL success;

// First, build the above XML:

CkoXml *xml = [[CkoXml alloc] init];
xml.Tag = @"cdr";
[xml AddAttribute: @"id" value: @"4e5d3e7f41bf6201ad81000c29703270"];
[xml AddAttribute: @"e164" value: @"6207"];
[xml UpdateAttrAt: @"user|grp" autoCreate: YES attrName: @"name" attrValue: @"wfln"];
[xml UpdateAttrAt: @"user|grp" autoCreate: YES attrName: @"mode" attrValue: @"active"];
[xml UpdateAttrAt: @"event" autoCreate: YES attrName: @"msg" attrValue: @"setup-to"];
[xml UpdateAttrAt: @"event" autoCreate: YES attrName: @"time" attrValue: @"287069"];
[xml UpdateAttrAt: @"event" autoCreate: YES attrName: @"e164" attrValue: @"5034"];
[xml UpdateAttrAt: @"event[1]" autoCreate: YES attrName: @"msg" attrValue: @"alert-from"];
[xml UpdateAttrAt: @"event[1]" autoCreate: YES attrName: @"time" attrValue: @"287069"];
[xml UpdateAttrAt: @"event[1]" autoCreate: YES attrName: @"e164" attrValue: @"5034"];
[xml UpdateAttrAt: @"event[2]" autoCreate: YES attrName: @"msg" attrValue: @"rel-to"];
[xml UpdateAttrAt: @"event[2]" autoCreate: YES attrName: @"time" attrValue: @"287079"];
[xml UpdateAttrAt: @"event[2]" autoCreate: YES attrName: @"e164" attrValue: @"5034"];

// Show that we have the above XML
NSLog(@"%@",[xml GetXml]);

// Find the element where msg = "alert-from"
// This updates the xml object's reference to the found element (if successful).
NSString *notUsed = [xml ChilkatPath: @"/A/event,msg,alert-from|$"];
if (xml.LastMethodSuccess == NO) {
    NSLog(@"%@",@"Not found.");
    return;
}

// Get the value of the "time" attribute.
NSLog(@"%@%@",@"time = ",[xml GetAttrValue: @"time"]);

// Restore the xml object's internal reference to the root of the XML document
[xml GetRoot2];