Xen devel - Oct 2011 - question about relationship between /var/lib/xenstored/tdb and xenstore_domain_interface

Hi, when I read following link,
http://wiki.xen.org/xenwiki/XenIntro
, then I browsed some Xen 3.1 code. A question puzzles me.
As we know "The physical xenstore resides in one file:
/var/lib/xenstored/tdb. " , but drives(frontend/backend) visit
Xenstore by Xenbus. The data structure manipulated by Xenbus is
xenstore_domain_interface, not tdb. while tdb file is visited by
Xenstored daemon.

I cann''t figure out the relationship between tdb and 
xenstore_domain_interface.

For example,  if Xenbus sends a  XS_DIRECTORY  query message , where
does the reply message come from?

Thanks in advance!

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zhao bao writes ("[Xen-devel] question about relationship between
/var/lib/xenstored/tdb and
xenstore_domain_interface"):
>   Hi, when I read following link,
> http://wiki.xen.org/xenwiki/XenIntro
> , then I browsed some Xen 3.1 code. A question puzzles me.
> As we know "The physical xenstore resides in one file:
> /var/lib/xenstored/tdb. " , but drives(frontend/backend) visit
> Xenstore by Xenbus. The data structure manipulated by Xenbus is
> xenstore_domain_interface, not tdb. while tdb file is visited by
> Xenstored daemon.
Please see
  docs/misc/xenstore.txt
  xen/include/public/io/xs_wire.h
  tools/xenstore/
in the Xen source tree.

Ian.

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