Hopefully someone can tell you of a direct solution, but I can tell you my
experiences using perl.

1. Do I understand correctly that using one of these tools I can hand my xml-formatted data file to postgres and it will be inserted into the database?
2. How does the database "know" the layout?  I am dealing with health case claim data using the EDI X12 standard (such as it is).  It is well defined, but large and complex (well beyond the "mailing list" examples I've seen).  Do I need to post a DTD or Schema to Postgres?  Or does it simply (!) create tables and links to accommodate whatever relationships are defined in the data file? Or is the xml dumped into 1 large field?
   
3. When I add additional data to the database (another claim file from another vendor or day), will it be added to the existing data, or -- I assume -- entered into the base using the new root node?
4. How do I extract data from the database?  Do I use XPath type queries?
5. Is it possible to insert, update, change, delete data from the data file on the base?  If so, can I issue a command to extract the entire document with the modified data?
6. Can you point me to documentation on any of this?  Is it worth the trouble?  Or should I dissect the file into traditionally normalized tables?

Greg Lindstrom               501 975.4859
Computer Programmer          greg.lindstrom@novasyshealth.com
NovaSys Health
Little Rock, Arkansas

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