There is no paragraph preceding the list of steps making it all somewhat confusing.
It should probably be a requirement that the document is _namespace_ well-formed. To prevent any confusion. "If any of the following attributes are in error or invalid," is double and also somewhat recursive. E.g. invalid depends on the definition of in error. It is also unclear what "following attributes" refers to here. "If any other attribute, in any XML namespace, apart from xml:lang, is used, then the attribute is in error and the user agent must ignore it." Is this not again stating what has already been stated? Duplicating requirements makes the specification very hard to read. -- Anne van Kesteren http://annevankesteren.nl/
