Children, this is the picture of “XML”. Document Markup Language. It was used by the end of the XX-th century.[/leftblock]
This was a post from May 2015. Unfortunately it is still actual in May 2018.
This probably applies to you. Especially if you are an Developer. Or if you suspect you might be a .NET Lemming? (A member of any large group following an unthinking course towards mass destruction)
.NET and SharePoint in particular are two likely offenders here. It is now 2015 (May) … Oops? It is already 2018, May.
This subject (XML in software development) has been reiterated to death. And back.