Xsd provider requires wrapper element

[nwolverson]

Seems like the XSD provider can't parse documents conforming to those schemas that it supports - it requires a wrapper element around those defined in the schema (tests have a top level <schema> element in the XML being parsed for some reason - not the schema, the actual XML document).

On top of that if the schema namespace is included it won't parse either.

[nwolverson]

I see ParseRootType generated method where RootType is the root element type works; missing part would be for Parse and Load methods to behave like this for the root element, ie handle top level xs:element better for the properties on the top-level provided type.