[phpXML] Help with XPath expression

[<an...@is...>]

What kind of XPath expression can I use to select the names of all the
child nodes? That is, given the following fragment:

  <publication>
    <foo1>
     ..
    </foo1>
    <foo2>
     ..
	</foo2>
    ..
  </publication>

I want to get the names of all nodes under <publication>.

Thanks,

-Andrei
* How would this sentence be different if Pi was equal to three? *

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