Re: [racket-users] reading writing the preamble of an XML file

[Matthew Butterick]

Yes, I packaged the logic described by Jay into some utility functions in
my sugar/xml module to make it easier to read  write an XML file with its
prolog:

http://pkg-build.racket-lang.org/doc/sugar/#%28part._.X.M.L%29

On Tue, Apr 21, 2015 at 7:25 AM, Nadeem Abdul Hamid nad...@acm.org wrote:

 Was there ever a resolution to this question?


 On Mon, Mar 30, 2015 at 2:12 PM, Matthew Butterick m...@mbtype.com wrote:

 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\?roothello 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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[racket-users] reading writing the preamble of an XML file

[Matthew Butterick]

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\?roothello 
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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