$\DeclareMathOperator{\homop}{Hom} \newcommand{\Hom}[2]{\homop\left(#1,\,#2\right)} \newcommand{\lt}{<} \newcommand{\gt}{>} \newcommand{\amp}{&} \definecolor{fillinmathshade}{gray}{0.9} \newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}} $

Section 52.3 Emitting a Message from a Stylesheet

An <xsl:message> begins with the token that names its severity: PTX:DEBUG, PTX:INFO, PTX:FALLBACK, PTX:WARNING, PTX:ERROR, PTX:BUG, or PTX:FATAL. A fatal message additionally carries terminate="yes". Deprecations are the one exception: they are emitted through a shared template and carry PTX:DEPRECATE, which is treated as a warning.

The Python layer reads the leading token of each stylesheet message and re-emits it at the corresponding severity. A message whose token is malformed—a stray space, the wrong case—is itself reported as a bug, so an authoring slip is surfaced rather than silently demoted.

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