[SMARTY] Associative Arrays with special characters

I have a serialized XML document in an associative array using 
XML_Serializer.  Due to the use of namespaces, many of the elements in 
the document use a colon (:) within the name.  Since the names are 
stored as the array key, this causes problems with smarty.

How do I reference a variable such as this within smarty:
$array['xlink:href'] ?

When I attempt to use the correct syntax {$array.xlink:href} I get the 
following error:
syntax error: unrecognized tag

Any ideas?

Thanks
Andrew

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