I understand that the preamble of an XML file (e.g., a first line like <?xml 
version="1.0" encoding="utf-8"?>) is not part of the X-expression representing 
that file. 

That's why in `response/xexpr`, there's an option for adding a preamble. [1]

But with static XML files, I'm unclear about how preambles are supposed to be 
handled. Use case: reading an XML file, modifying it, writing it back out with 
the same preamble.

Reading: is the preamble just discarded? Am I supposed to grab it with [small 
shiver] a regular expression?

;;;
#lang racket/base
(require xml)
(define x (string->xexpr "<?xml version=\"1.0\" encoding=\"utf-8\"?><root>hello 
world</root>"))

> x
'(root () "hello world") 
;;;


Writing: functions like `xexpr->xml` and `xexpr->string` of course take an 
Xexpr without a preamble. Again, is the intention that it be added manually 
(e.g. with `string-append`)?




[1] 
http://docs.racket-lang.org/web-server/http.html?q=response%2Fxexpr#%28def._%28%28lib._web-server%2Fhttp%2Fxexpr..rkt%29._response%2Fxexpr%29%29

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