james mckay dot net
because there are few things that are less logical than business logic

XsltArgumentList violates the Single Responsibility Principle

Can somebody please enlighten me as to why XsltMessageEncountered and AddExtensionObject are members of System.Xml.Xsl.XsltArgumentList?

It seems like a violation of the Single Responsibility Principle to me — neither of them are anything to do with the list of arguments that you pass into your transform. It would make more sense if they were members of XslCompiledTransform instead.