\xmlns:html{http://www.w3.org/1999/xhtml}

\def\shiki/loadLanguages{c,javascript}
\def\shiki/rootPath{/forest}

\alloc\shiki/language
\def\shiki[body]{
\scope{
\<html:shiki-block>[language]{\get\shiki/language}[load-languages]{\shiki/loadLanguages}[root-path]{\shiki/rootPath}{\body}
}
}