DDL for postgres database

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Date: Thu, 21 May 1998 14:08:33 -0400 (EDT)
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>From scrappy@postgreSQL.org  Thu May 21 14:08:10 1998
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From: nyang@bbn.com
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Date: Thu, 21 May 1998 14:07:02 -0400
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To: questions@postgreSQL.org
Subject: DDL for postgres database
Cc: nyang@ohio.bbn.com
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Hi,

I have used postgres for our application.
Our customer is asking us to give them the DDL (data definition 
language) files for the database.

I don't know what the customer means and feel awkward to ask them.
May be someone could give me a hint?

If anyone knows what DDL means for the postgres database,
please let me know ASAP.  Thanks a million.

Nancy