Incorrect textequation syntax

[djn-ams]

There's a fundamental incompatibility between how texml and tex handle the textequation environment. Specifically, the usual tex version accepts an optional argument (which is actually mandatory if you wish to label [or tag] the textequation) whereas the texml implementation takes no such optional argument.

Here's the relevant bit of the texml implementation:¹

\newenvironment{textequation}{%
...

And here's the tex implementation:²

\newenvironment{textequation}[1][]{%
...

This incompatibility means, when producing HTML, textequation produces a superfluous pair of [, ]s. As the optional argument structure is, more-or-less, necessary for the tex implementation, it'd probably be best to change the texml implementation to match.

Footnotes

1. /ams/texmf/texml/lib/perl/TeX/Interpreter/Package/amsmath.pm ↩

2. /ams/texmf/archive/texlive2016/texmf-prd/tex/latex/amscls/amsart.cfg ↩