As far as I understand XPath, /yyy will look for a root node of <yyy>, which you don't have. Either /xxx/yyy or //yyy should find the yyy node.
Update: This just shows what little I know of namespaces. I think ikegami's reply is correct and this one is wrong. With a root node of xxx, $root->findNodes should find /yyy in <xxx><yyy></xxx>, but the namespace prevents the match.
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