Suppress xparse message “Redefining document command”

Question

I am trying to suppress messages of the form:

*************************************************
* LaTeX warning: "xparse/redefine-command"
* 
* Redefining document command \MyMacro with arg. spec. 'm' on line 29.
*************************************************

I tried to use the silence package, but can't determine how to correctly use that package for such errors.

Code:

\documentclass{article}
\usepackage{xparse}
\usepackage{silence}

%% All these attempts do not solve this problem.
\WarningsOff[latex]
\WarningsOff[xparse]

\WarningFilter{latex}{LaTeX warning}
\WarningFilter{xparse}{LaTeX warning}

\WarningFilter{latex}{Redefining document command}
\WarningFilter{xparse}{Redefining document command}

\NewDocumentCommand{\MyMacro}{m}{\textbf{#1}}


\begin{document}
\MyMacro{some text}

\RenewDocumentCommand{\MyMacro}{m}{\emph{#1}}%

\MyMacro{some more text}
\end{document}

Answer 1

You can't use silence for this, because xparse and all packages in the l3kernel suite (LaTeX3) use a very different method for issuing warnings, and definitely not the \PackageWarning macros on which silence relies.

The correct way for suppressing warnings is

\usepackage[log-declarations=false]{xparse}

The code connected with this option is

\DeclareOption { log-declarations = false }
  {
    \msg_redirect_module:nnn { LaTeX / xparse } { info }    { none }
    \msg_redirect_module:nnn { LaTeX / xparse } { warning } { none }
  }

that redirects only messages from the xparse module to "none".