来自 dvisvgm 文档：
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)}.
如果我将以下 TeX 文件编译为 DVI，然后使用 dvisvgm 将其转换为 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
然后 SVG 输出是：
<?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>
重要的部分是，命名的组abc包含在输出中。
现在我尝试做同样的事情，但通过 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}
特价商品如预期般包含在 PDF 中：
%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
然后我将 SVG 转换为 PDF：
dvisvgm --pdf --output=main.svg main.pdf
但 SVG 不包含所需的标签。
问题：是否可以进行 TeX → PDF → SVG 编译，并在 TeX 源代码中指定要插入到最终 SVG 文件中的原始 SVG 标签（就像我在 TeX → DVI → SVG 编译中所做的那样）？