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    <p>I now have a hack where I perform the following:</p> <ul> <li>Read the XML as a string.</li> <li>Parse using a regular expression to find all processing instructions.</li> <li>Add all the processing instructions into a string array.</li> <li>Use the regular expression to remove the processing instructions</li> </ul> <p>This then allows me to execute the XPath queries without issue. However if I then need to write the XML back I need to:</p> <ul> <li>Create a new mutable string to hold the output XML document/</li> <li>Loop through the processing instructions and append them to the new output XML document string.</li> <li>Get the string from my real XML document and append to the new output XML string.</li> </ul> <p>However this is far from optimal and I don't understand why the processing instructions break the XPath queries in KissXML. Here is an example of my code:</p> <pre><code> // Load the XML file from the application bundle NSString *xmlFilename = @"demo1-5.xml"; NSLog(@"**** About to parse %@ ****\n\n", xmlFilename); NSString *XMLPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:xmlFilename]; NSString *xmlStringData = [NSString stringWithContentsOfFile:XMLPath encoding:NSUTF8StringEncoding error:nil]; // Now that we have the XML as a string, use regex to: // 1) Find all processing instructions NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"&lt;\\?.*?\\?&gt;" options:NSRegularExpressionCaseInsensitive error:nil]; processingInstructions = [[NSMutableArray alloc] init]; [regex enumerateMatchesInString:xmlStringData options:0 range:NSMakeRange(0, [xmlStringData length]) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop){ // 2) Put all the matches in an array NSString *toStore = [xmlStringData substringWithRange:[match range]]; [processingInstructions addObject:toStore]; }]; // 3) Remove all processing instructions from the XML string NSString *newString = [regex stringByReplacingMatchesInString:xmlStringData options:0 range:NSMakeRange(0, xmlStringData.length) withTemplate:@""]; // Having removed the processing instructions, we can now parse the XML NSError *err=nil; NSURL *furl = [NSURL fileURLWithPath:XMLPath]; if (!furl) { NSLog(@"Can't create an URL from file: %@.", XMLPath); return; } xmlViewDoc = [[DDXMLDocument alloc] initWithXMLString:newString options:0 error:&amp;err]; // Now execute an XPath query using the namespace NSString *xPathQuery = @"/tst:TstForm/tst:TstDetails"; NSArray *nodes = [xmlViewDoc.rootElement nodesForXPath:xPathQuery error:nil]; for (DDXMLElement *node in nodes) { NSLog(@"Title Value: %@", node.stringValue); } // Finally we'll generate a new XML string which is a concatenation of // the processing instructions and the NSXMLDocument. NSMutableString *xmlOutputString = [[NSMutableString alloc] init]; for (NSString *piString in processingInstructions) { [xmlOutputString appendFormat:@"%@\n", piString]; } [xmlOutputString appendString:[xmlViewDoc XMLStringWithOptions:DDXMLNodePrettyPrint]]; NSLog(@"XML:\n%@", xmlOutputString); </code></pre>
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