String could not be parsed as XML

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Reference - What does this error mean in PHP? 30 answers

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The XML appears to be invalid in lines 4 and 5:

<notableFor>Fruit</title>
<wikiid>Apple</title>

Which should be:

<notableFor>Fruit</notableFor>
<wikiid>Apple</wikiid>

I recommend using the XML validator at http://www.w3schools.com/xml/xml_validator.asp to debug errors with your XML code.

Also, as your root element is item, you may want to change your PHP code:

<?php   
    $url = 'http://myknowledge.org.uk/xml';
    $item = new SimpleXMLElement(file_get_contents($url));
    $title = $item->title;
    $description = $item->description;
?>

(I don't have a copy of PHP on hand to test this, but according to http://php.net/manual/en/simplexml.examples-basic.php, this should work)

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Xml can have only 1 root element, in your example the root is item

When loading to SimpleXML you can get the root name with $xml->getName()

$url = 'http://myknowledge.org.uk/xml';
$item = new SimpleXMLElement($url, null, true);
$title = $item->title;
$description = $item->description;

Or you should enclose you items in another root ie items if you need multiple

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