Lets say we have the following xml:
<root>
<element1>
<element2>sometext</element2>
</element1>
<element1>
<element2>somemoretext</element2>
</element1>
</root>
I presume you want to access the element2 nodes. You can do this with the following XPATH: /root/element1/element2. This will create a series of multivalued variables:
${requestXpath.count}: The number of found nodes, in this case 2
${requestXpath.results}: MultiValued variable that contains the full nodes, with enclosing tags, eg: <element2>sometext</element2>, <element2>somemoretext</element2>
${requestXpath.elements}: Multivalued variable that contains the text of the selected nodes, eg: sometext, somemoretext
You can use any of those variables that suit you with a "Run assertions for each item" folder assertion which will apply all the assertions contained in that folder to each element of the multivalued variable.
The policy attached to this message is a sample that demonstrates the logic with a simple xml.
I hope you find this helpful.