clojure.data.xml with newline / return in attribute values

[Jochen]

Hi…

an unexpected problem that I currently  face is about newline and return 
characters in xml attribute values.

I first found it in good old clojure.xml and thought to fix it with 
Clojure.data.xml (0.0.8 and 0.2.0-alpha3 tried), but it did not help. 

When I read in some external xml with escaped cr/lf (
) in an 
attribute value, it is parsed correctly., but when I write it out again the 
\r\n appears in the output unescaped, breaking the attribute value on next 
read.

Here is some real stuff showing the issue:
  ;; cr lf are not escaped:
  (prn (xml/emit-str (xml/element :foo {:bar "Baz\r\nquux"})))
  ;; => "<?xml version=\"1.0\" encoding=\"UTF-8\"?><foo 
bar=\"Baz\r\nquux\"></foo>"

  ;; if we escape manually, the ampersand is escaped:
  (prn (xml/emit-str (xml/element :foo {:bar "Baz&#13;&#10;quux"})))
  ;; => "<?xml version=\"1.0\" encoding=\"UTF-8\"?><foo 
bar=\"Baz&amp;#13;&amp;#10;quux\"></foo>"
  
;; we can fix after the fact with some string replacer, but this feels 
really hacky:
  (prn (-> (xml/emit-str (xml/element :foo {:bar "Baz&#13;&#10;quux"}))
           (str/replace "&amp;#" "&#")))
  ;; => "<?xml version=\"1.0\" encoding=\"UTF-8\"?><foo 
bar=\"Baz&#13;&#10;quux\"></foo>"

  ;; although it is then reparsed correctly: 
  (prn (-> (xml/emit-str (xml/element :foo {:bar "Baz&#13;&#10;quux"}))
           (str/replace "&amp;#" "&#")
           (xml/parse-str)))
 ;;=> #clojure.data.xml.Element{:tag :foo, :attrs {:bar "Baz\r\nquux"}, 
:content ()} 

Looking into the emit code, it seems like this is a Java XMLStreamWriter 
issue?!

Any idea how to fix this in a clean way?

Ciao

…Jochen

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