Using XML Bulk Load to Import large XML data into SQL server 2012

Question

I've downloaded the latest English Wikipedia dump (enwiki-latest-pages-articles.xml), and I'm trying to import it to SQL server 2012 by using XML Bulk Load. This is the VBScript code I've used:

Dim objBL 
Set objBL = CreateObject("SQLXMLBulkLoad.SQLXMLBulkload.4.0")
objBL.ConnectionString = "provider=SQLOLEDB;datasource=localhost;
database=Wikipedia;integrated security=SSPI"
objBL.ErrorLogFile = "error.log"

objBL.CheckConstraints=true
objBL.XMLFragment = True
objBL.SchemaGen = True
objBL.SGDropTables = True

objBL.Execute "export-0.8.xml", "enwiki-latest-pages-articles.xml"
Set objBL = Nothing

This VBScript should generate the tables and load the Wikipedia XML file into them. The VBScript code also uses the wikimedia XSD schema. However, I'm getting this error:

 schema multiple base for a derived type on lang is not supported
 code: 80004005

Any help with this problem would be appropriate!