[racket-users] XML Modification

[Lehi Toskin]

I have some XML - rather, XMP data from an image - that I'd like to mess around 
with. I've investigated the xml library and found that I can turn the XML into 
an XEXPR so I can play around with it like that and even search through it with 
se-path*/list, but how would I go from there to replacing parts of the XEXPR? 
By my reckoning, I'd need to scan through the list and locate the data I want 
and then do something like list-set, but searching through an XEXPR that can 
have many nested sublists sounds like a nightmare to program for.

I suppose I could take a look at the XML string and do a regexp-match or 
something similar, but that seems inelegant and almost brute-force-y.

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Re: [racket-users] XML Modification

[Matthew Butterick]

> On Dec 14, 2016, at 3:04 PM, Lehi Toskin  wrote:
> 
> I have some XML - rather, XMP data from an image - that I'd like to mess 
> around with. I've investigated the xml library and found that I can turn the 
> XML into an XEXPR so I can play around with it like that and even search 
> through it with se-path*/list, but how would I go from there to replacing 
> parts of the XEXPR? By my reckoning, I'd need to scan through the list and 
> locate the data I want and then do something like list-set, but searching 
> through an XEXPR that can have many nested sublists sounds like a nightmare 
> to program for.


My `txexpr` library has some higher-level utilities for working with 
complicated X-expressions.

http://docs.racket-lang.org/txexpr/ 


Also see `pollen/decode`, which I designed for selective replacements within 
text-based X-expressions, but will work with any X-expression:

http://docs.racket-lang.org/pollen/Decode.html?q=pollen%2Fdecode 



> I suppose I could take a look at the XML string and do a regexp-match or 
> something similar, but that seems inelegant and almost brute-force-y.

That way madness lies.

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Re: [racket-users] XML Modification

[Lehi Toskin]

> http://docs.racket-lang.org/txexpr/

Hoo-ray! splitf-xexpr is *exactly* what I needed. Thank you for your help!

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