Urgent: Way to XML-parse data with <f n="name"> </f> tags?

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I've been trying to retro-fit sample code found at : http:// www.sitepoint.com/article/php-xml-parsing-rss-1-0 to parse XML coming from a server.

I'm sooo close to getting this working, but I've hit a roadblock and could use some help.

To see the data I'm needing to parse, go here: http:// www.librarytools.com/events/sampledata.txt. This is just sample data from the host, as it's behind a firewall.

The problem I'm having is that the XML data that comes back from the host doesn't just have <eventname> </eventname> tags. It has <f n="eventname">datahere</f> tags, and I don't know how to get the XML parser to read the values using that format. (And I don't have control over the host) As a first step, I just want to retrieve the "eventname", "venuename", and "venuecity" data from within the "result" tags at the bottom of the data.

I'm really hoping this is possible with PHP - - - can someone please steer me in the right direction and tell my what I should change in the below script? The $tag value is not getting a value string, due to the XML-data....

Here's my present script:

<?php

$insideitem = false;
$tag = "";
$eventname = "";
$venuename = "";
$venuecity = "";

function startElement($parser, $name, $attrs) {
	global $insideitem, $tag, $eventname, $venuename, $venuecity;
	if ($insideitem) {
		$tag = $name;
		
	} elseif ($name == "RESULT") {
	    echo "found result";
		$insideitem = true;
	}
}

function endElement($parser, $name) {
	global $insideitem, $tag, $eventname, $venuename, $venuecity;
	if ($name == "RESULT") {
	echo "result in endElement";
		printf("<dt><b><a href='%s'>%s</a></b></dt>",
			trim($venuecity),htmlspecialchars(trim($eventname)));
		printf("<dd>%s</dd>",htmlspecialchars(trim($venuename)));
		$eventname = "";
		$venuename = "";
		$venuecity = "";
		$insideitem = false;
	}
}

function characterData($parser, $data) {
	global $insideitem, $tag, $eventname, $venuename, $venuecity;
	if ($insideitem) {

    echo $tag;

	switch ($tag) {
		case "EVENTNAME":
		$eventname .= $data;
		echo "got an event!";
		break;
		case "VENUENAME":
		$venuename .= $data;
		break;
		case "VENUECITY":
		$venuecity .= $data;
		break;
	}
	}
}
$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");
$fp = fopen("http://www.librarytools.com/events/sampledata.txt","r";)
	or die("Error reading RSS data.");
	
echo $fp;
	
while ($data = fread($fp, 4096))
	xml_parse($xml_parser, $data, feof($fp))
		or die(sprintf("XML error: %s at line %d",
			xml_error_string(xml_get_error_code($xml_parser)),
			xml_get_current_line_number($xml_parser)));
fclose($fp);
xml_parser_free($xml_parser);

?>

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