Clojure XML Parsing

Suppose you have the following xml to parse in your file:

<high-node>   <low-node>my text</low-node></high-node>

you load clojure.xml:

user=> (use 'clojure.xml)

when parsed, the xml will have the following structure:

{:tag :high-node, :attrs nil, :content [{:tag :low-node, :attrs nil, :content ["my text"]}]}

and then you can seq over the content of the file to get the content of the low-node:

user=> (for [x (xml-seq               (parse (java.io.File. file)))                 :when (= :low-node (:tag x))]         (first (:content x)))("my text")

Similarly, if you wanted to have access to the entire list of information on low-node, you would change the :when predicate to (= (:high-node (:tag x))):

user=> (for [x (xml-seq               (parse (java.io.File. file)))                 :when (= :high-node (:tag x))]         (first (:content x)))({:tag :low-node, :attrs nil, :content ["my text"]})

This works because the keywords can operate as functions. See Questions about lists and other stuff in Clojure and Data Structures: Keywords

The above answer works, but I find it a lot easier to use clojure.data.zip.xml (used to be clojure-contrib.zip-filter.xml prior to Clojure 1.3).

file:

myfile.xml:

<songs>  <track id="t1"><name>Track one</name></track>  <track id="t2"><name>Track two</name></track></songs>

code:

; Clojure 1.3(ns example  (:use [clojure.data.zip.xml :only (attr text xml->)]) ; dep: see below  (:require [clojure.xml :as xml]            [clojure.zip :as zip]))(def xml (xml/parse "myfile.xml"))(def zipped (zip/xml-zip xml))(xml-> zipped :track :name text)       ; ("Track one" "Track two")(xml-> zipped :track (attr :id))       ; ("t1" "t2")

Unfortunately, you need to pull in a dependency on data.zip to get this nice read/filter functionality. It's worth the dependency :) In lein it would be (as of 17-Aug-2013):

[org.clojure/data.zip "0.1.1"]

And as for docs for data.zip.xml ... I just look at the relatively small source file here to see what is possible. Another good SO answer here, too.