xPath query problem

In a previous question, user helped me but i'm stuck of doing simple request :

<?php $nodes = $xPath->query('//table[@class="some_class"]');

But it returns me the whole table datas instead of rows of the table, that's why i want to retrive only "td" of the table.

I tryed (but it's n开发者_StackOverflow社区ot working)

 <?php $nodes = $xPath->query('//table[@class="some_class"]/tbody/tr');

What am I doing wrong please ?

*EDIT HTML structure *

<table class="some_class">
<tbody><tr>
<td class="firstcol" width="160">name</td>
<td width="250">Some&nbsp;Data</td>
</tr>

---

//table[@class='some_class']//td

Added a middle // in there because of my mistrust at any level of tbody's actually being there (although for DOM they should be).

---

Assuming that the path matches correctly, you may just need to append /* to match all child nodes:

//table[@class="some_class"]/tbody/tr/*