FAQ:
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Q: Why doent it recognise the relation in the data?
A: The data isn't analysed, only the XML structure.

Q: Why doesn't the generated select statements bring back data?
A: The DDL is analysed to produce the select statements,
   the data may have mutually inclusive joins, or there isn't data
   in the fields.

Q: Why does it take so long to create the database?
A: XML::RDB is based on XML::DOM::Parser loading the XML tree structure
   from file into memory before any other work is commenced. There are
   a couple of passes through the tree which analyse and build the 
   DDL.  Loads the DDL, then extracts and loads the XML data.
   
   
