<center>
<all-centers xmlns = "http://www.nda-centres.com/namespaces">

That is a center element in no namespace with child a all-centers
element in the namespace http://www.nda-centres.com/namespaces
(Do you really want to change namespaces at that point?)

An Xpath that selects that would be

/center/x:all-centers

where x: has been bound to the http://www.nda-centres.com/namespaces
namespace

so you want

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
xmlns:x="http://www.nda-centres.com/namespaces">


<xsl:template match="/">
<xsl:value-of select="/center/x:all-centers"/>

Xpaths like attribute names do not use the default namespace binding:
unprefixed QNames in XPath always refer to elements or attributes in no
namespace. 

David
(This is a FAQ)

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