What are the different options to generate an XML Schema Collection?

Option 1 - CREATE XML SCHEMA COLLECTION XXX AS ‘…’

Option 2 - Use Microsoft XSD inference tool 

Option 3 - Use other free and non-free third party tools (see http://stackoverflow.com/questions/74879/any-tools-to-generate-an-xsd-schema-from-an-xml-instance-document)

Option 4 - In BIDS 2005+, copy the xml code from SSMS to the xml editor window in VS or BIDS, from the XML menu, choose Generate Schema. See below for details: