De la documentación de dvisvgm:
SUPPORTED SPECIALS
dvisvgm supports several special commands that enrich the DVI command set with additional
instructions for features, like color, graphics, and hyperlinks. The term special command,
or just special, originates from the TeX command \special{...} which does almost nothing.
[...]
dvisvgm
dvisvgm offers its own small set of specials. The following list gives a brief
overview.
dvisvgm:raw text
Adds an arbitrary sequence of XML nodes to the page section of the SVG document.
dvisvgm checks syntax and proper nesting of the inserted elements but does not
perform any validation, thus the user has to ensure that the resulting SVG is
still valid. Opening and closing tags may be distributed among different raw
specials. The tags themselves can also be split but must be continued with the
immediately following raw special. Both syntactically incorrect and wrongly nested
tags lead to error messages. Parameter text may also contain the expressions {?x},
{?y}, {?color}, and {?matrix} that expand to the current x or y coordinate, the
current color, and current transformation matrix, respectively. Character sequence
{?nl} expands to a newline character. Finally, constructions of the form {?(expr)}
enable the evaluation of mathematical expressions which may consist of basic
arithmetic operations including modulo. Like above, the variables x and y
represent the current coordinates. Example: {?(-10*(x+2y)-5)}.
Si compilo el siguiente archivo TeX en DVI, uso dvisvgm para convertirlo a SVG:
\pdfoutput=0
\pdfcompresslevel=0
\pdfobjcompresslevel=0
\documentclass{article}
\usepackage[active, tightpage]{preview}
\usepackage{tikz}
\pagenumbering{gobble}
\begin{document}
\begin{preview}
\special{dvisvgm:raw <g id='abc'>}
\begin{tikzpicture}
\draw (0,0) circle (1);
\end{tikzpicture}
\special{dvisvgm:raw </g>}
\end{preview}
\end{document}
→
dvisvgm --output=main.svg main.dvi
Entonces la salida SVG es:
<?xml version='1.0' encoding='UTF-8'?>
<!-- This file was generated by dvisvgm 3.1.2 -->
<svg version='1.1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' width='57.0899pt' height='57.0899pt' viewBox='-.00005 -57.08985 57.0899 57.0899'>
<g id='page1'>
<g id='abc'>
<path d='M56.8906-28.546875C56.8906-44.2031 44.2031-56.8906 28.546875-56.8906C12.8906-56.8906 .1992-44.2031 .1992-28.546875C.1992-12.8906 12.8906-.1992 28.546875-.1992C44.2031-.1992 56.8906-12.8906 56.8906-28.546875Z' stroke='#000' fill='none' stroke-width='.3985'/>
</g>
</g>
</svg>
Una parte importante es que los grupos nombrados abcse incluyen en el resultado.
Ahora intento hacer lo mismo, pero paso por PDF:
\pdfoutput=1
\pdfcompresslevel=0
\pdfobjcompresslevel=0
\documentclass{article}
\usepackage[active, tightpage]{preview}
\usepackage{tikz}
\pagenumbering{gobble}
\begin{document}
\begin{preview}
\special{pdf:dvisvgm:raw <g id='abc'>}
\begin{tikzpicture}
\draw (0,0) circle (1);
\end{tikzpicture}
\special{pdf:dvisvgm:raw </g>}
\end{preview}
\end{document}
Las ofertas especiales están incluidas en el PDF como se esperaba:
%PDF-1.5
%ÐÔÅØ
6 0 obj
<<
/Length 392
>>
stream
1 0 0 1 0.5 57.591 cm
dvisvgm:raw <g id='abc'>
1 0 0 1 28.546 -28.545 cm
q
0 G
0 g
0.3985 w
q
0.0 0.0 m
Luego convierto el SVG a PDF:
dvisvgm --pdf --output=main.svg main.pdf
pero el SVG no contiene las etiquetas deseadas.
Pregunta:¿Es posible hacer una compilación TeX → PDF → SVG y especificar una etiqueta SVG sin formato en el código fuente de TeX para insertarla en el archivo SVG final?(¿Como lo que hice en la compilación TeX → DVI → SVG)?