Re: Removing/Ignoring xmlns when using xml->sxml

[Luis Felipe <sirgazil@zoho.com>]

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Hi Richard,

El 22/07/24 a las 3:11, Richard Sent escribió:
> Hi all,
>
> I have some XML created by a tool called latexml that can convert LaTeX
> equations to MathML. I am processing the output of this tool as part of
> a Guile program and will be using it in a website.
>
> The output looks something like this:
>
> --8<---------------cut here---------------start------------->8---
> <math xmlns=\"http://www.w3.org/1998/Math/MathML\" alttext=\"\\frac{1}{2}\" display=\"block\">
>    <mfrac>
>      <mn>1</mn>
>      <mn>2</mn>
>    </mfrac>
> </math>
> --8<---------------cut here---------------end--------------->8---
>
> I need to convert this output to SXML to integrate it with the rest of
> the toolchain.
>
> Annoyingly, when using xml->sxml, the xmlns attribute is prepended to
> every non-default element. For example,
> '(http://www.w3.org/1998/Math/MathML:math ...) [1].
>
> This behavior is undesirable when splicing the MathML into HTML, since
> HTML doesn't support namespaces and web browsers don't seem to handle
> elements with colons. The intended conversion is to simply splice the
> MathML into HTML, sans namespace [2].
>
> xml->sxml has a #:namespaces argument that allows me to alias the URL
> namespace to something else in the SXML, but it doesn't look like I can
> alias it to a "nil" namespace that isn't prepended at all.

The following seems to work (where xml-string is the example you provided):

(define namespaces '((#false . "http://www.w3.org/1998/Math/MathML")))

(xml->sxml xml-string #:namespaces namespaces)
$7 = (*TOP* (math (@ (display "block") (alttext "\\frac{1}{2}")) "\n  " 
(mfrac "\n    " (mn "1") "\n    " (mn "2") "\n  ") "\n"))



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