Select an XML element regardless of level with XPATH

Question

I have this:

<a>   <b>     <t>text</t>   </b> </a> <a>   <t>text</t> </a> 

So I want to select the text regardless of where is it. (note that it can be anywhere not just 1/2 levels down, it can have no parents for instance)

Is this possible?