Da documentação do 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)}.
Se eu compilar o seguinte arquivo TeX para DVI, use dvisvgm para convertê-lo para 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
Então a saída SVG é:
<?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>
A parte importante é que os grupos nomeados abcsejam incluídos na saída.
Agora tento fazer a mesma coisa, mas passo pelo 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}
As promoções estão incluídas no PDF conforme esperado:
%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
Então eu converto o SVG para PDF:
dvisvgm --pdf --output=main.svg main.pdf
mas o SVG não contém as tags desejadas.
Pergunta:é possível fazer uma compilação TeX → PDF → SVG e especificar a tag SVG bruta no código-fonte TeX a ser inserida no arquivo SVG final(assim como fiz na compilação TeX → DVI → SVG)?