> I have modified my tool to log messages in case of errors reported by
> the API, and I would like to do the same for warnings, but I'd like to
> be sure about the format.
> For example, I received the following warning :
> Too many values supplied for parameter 'titles': the limit is 50
> Is it always the same format : a code in a tag, and the description as
> text ?
Yes. The code in the tag is the name of the module that threw the warning (so your example is a bug: the tag should be <query>), and the warnings themselves are inside the tag, separated by newlines.