WSDL import and XSD import

http://www.ibm.com/developerworks/xml/library/ws-tip-imports.html

an interesting article on the mysteries of WSDLs... its conclusions are:

• It is a good practice to use XSD imports to import schema, and to use WSDL imports to import WSDL.
• It is a good practice to import all of the namespaces that you use.
• An attribute value of the import namespace must match the imported targetNamespace value.
• The primary purpose of an import statement is to import namespaces. The schemaLocation and location attributes, though sometimes necessary, are really only hints.