Code review for XML patch. Instill a bit of sanity in the location of

Tom Lane <tgl@sss.pgh.pa.us>

Commit: c957c0bac7f9785ae2a7520a9f693eeda0ff545b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2006-12-24T00:29:20Z
Releases: 8.3.0
Code review for XML patch.  Instill a bit of sanity in the location of
the XmlExpr code in various lists, use a representation that has some hope
of reverse-listing correctly (though it's still a de-escaping function
shy of correctness), generally try to make it look more like Postgres
coding conventions.

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