clj-xpath for xml with simple and nested tags

I have function (contents-only) that extracts contents from xml using clj-xpath library.

(ns example
(:use  [clj-xpath.core]))

 (def data-url
"http://ift.tt/1BaHRo1")

(defn xml-data [url] (slurp url))

(defn defxmldoc [url]
      (xml->doc (xml-data url)))

(defn contents-only [url root-tag tags] 
 (vec(map(fn [item]
         (into {}
              (map (fn [tag]
                     [tag ($x:text (str "./" (name tag))item)])tags)))
      (take 5 ($x root-tag (defxmldoc url))))))

The function call looks like this

(contents-only data-url "/search/events/event" [:title :url])

It works fine with not-nested tags, when I try to extract text from a nested tag ie.

<performers>
 <performer>
   <id>P0-001-000009049-1</id>
    <url>...</url>
    <name>Lindsey Buckingham</name>
    <short_bio>Rock</short_bio>
    <creator>TomAzoff</creator>
    <linker>evdb</linker>
</performer>

Function call looks like this

(contents-only data-url "/search/events/event" [:title :url :name])

I get RuntimeException Error, more (or less) than 1 result (0) from xml({:children...) for xpath(./name) http://ift.tt/1FKQnZu (core.clj:26)

How to change my contents-only function, so I can pass a nested tag as well?