gets the root node's name of a given document. Nice for quickly checking if a given XML document at least starts with the content you expect! (I use it with NSOpenPanel on OSX as well as View Controllers opening user content on IOS)

XMLUtils+RootNodeNameFromURL.mm

#import "XMLUtils.h"
#import <libxml/xmlreader.h>
 
@implementation XMLUtils
 
//...
 
+ (NSString*)rootNodeNameFromURL:(NSURL*)url {
    NSString* obj = nil;
    xmlTextReaderPtr reader = xmlReaderForFile( url.absoluteString.UTF8String,
                                               NULL,
                                               (XML_PARSE_NOBLANKS | XML_PARSE_NOCDATA | XML_PARSE_NOERROR | XML_PARSE_NOWARNING));
    if(reader != nil) {
        int ret = xmlTextReaderRead(reader);
        if(ret == 1) {
            obj = [NSString stringWithCString:(const char*)xmlTextReaderConstLocalName(reader)
                                     encoding:NSUTF8StringEncoding];
        }
        xmlFreeTextReader(reader);
    }
    return obj;
}
 
@end