Gets the type namespace.The namespace of the type declared for the associated element or attribute or null if the element does not have declaration or if no namespace information is available.
This method returns if there is a derivation between the reference type definition, i.e. the TypeInfo on which the method is being called, and the other type definition, i.e. the one passed as parameters.
If the document’s schema is an XML Schema [XML Schema Part 1], this constant represents the derivation by restriction if complex types are involved, or a restriction if simple types are involved.