How to reproduce the problem:

--- PHP script starts here ---
<?

$file = "data.xml";

function startElement($parser, $name, $attrs)
{
	if ($name=="PRODUKT") {
		print "Produkt-ID ".$attrs["ID"]."<BR>";
	}	
}

function endElement($parser, $name )
{}

$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
if (!($fp = fopen($file, "r"))) {
	die("could not open XML input");
}

while ($data = fread($fp, 4096)) {
	if (!xml_parse($xml_parser, $data, feof($fp))) {
		die(sprintf("XML error: %s at line %d",
		xml_error_string(xml_get_error_code($xml_parser)),
		xml_get_current_line_number($xml_parser)));
    }
}

xml_parser_free($xml_parser);

?>
--- end of script ---

--- XML data file ---
<?xml version="1.0" standalone="yes"?>

<import>


<produkt id="100">

	<text>iMac</text>

</produkt>


<produkt id="101">

	<text>IBM</text>

</produkt>

<produkt id="102">

	<text>Yakumo</text>

</produkt>

<produkt id="103">

	<text>IIyama</text>

</produkt>

<produkt id="104">

	<text>Microsoft</text>

</produkt>

<produkt id="105">

	<text>Noname</text>

</produkt>

<produkt id="106">

	<text>test</text>

</produkt>

<produkt id="107">

	<text>gaudi</text>

</produkt>

<produkt id="108">

	<text>icat sucks</text>

</produkt>

</import>
---end of XML---


now run the script on the xml-file, the output looks like this

--- sample output 1 ---
Produkt-ID 100
Produkt-ID 101
Produkt-ID 102
Produkt-ID 103
Produkt-ID 104
Produkt-ID 105
Produkt-ID 106
Produkt-ID 107
Produkt-ID 108
--- end ------------

now reload the page a couple of times, I sometimes get

-- sample output 2 ---
Produkt-ID 100P
Produkt-ID 101P
Produkt-ID 102P
Produkt-ID 103P
Produkt-ID 104P
Produkt-ID 105P
Produkt-ID 106P
Produkt-ID 107P
Produkt-ID 108P
--- end ----

That means some random characters are appended to the content of $attrs["ID"]


My PHP-Configuration

./configure --with-xml --with-gd=../gd1.3 --with-sybase-ct --enable-track-vars --with-apache=../apache_1.3.4

Expat Version 1.0.2