Darren New wrote:
> 
> Yes to all that. I don't even know of any existing hierarchical 
> databases *other* than UNIX-style file systems.
> 

Well IBM IMS is still around.  I don't have any stats on it but there 
are still banks and possibly airlines with core systems that run happily 
on it.

XML is also quite hierarchical in nature.  Of course it can be used in 
different ways but often it is just a tree structure with tags possibly 
at different levels.

Not sure what to make of the likes of Hadoop and Big Table yet.  I have 
the impression that they are more distributed file systems that offer 
some aspects of distributed DBMS - either hierarchical, relational or 
whatever else you care to put on top of them.

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