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Add XMLText function (SQL/XML X038)

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This function implements the standard XMLTest function, which
converts text into xml text nodes. It uses the libxml2 function
xmlEncodeSpecialChars to escape predefined entities (&"<>), so
that those do not cause any conflict when concatenating the text
node output with existing xml documents.

This also adds a note in  features.sgml about not supporting
XML(SEQUENCE). The SQL specification defines a RETURNING clause
to a set of XML functions, where RETURNING CONTENT or RETURNING
SEQUENCE can be defined. Since PostgreSQL doesn't support
XML(SEQUENCE) all of these functions operate with an
implicit RETURNING CONTENT.

Author: Jim Jones <jim.jones@uni-muenster.de>
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Discussion: https://postgr.es/m/86617a66-ec95-581f-8d54-08059cca8885@uni-muenster.de
This commit is contained in:
Daniel Gustafsson
2023-11-06 09:38:29 +01:00
parent 7b5275eec3
commit 526fe0d799
9 changed files with 167 additions and 1 deletions
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src/backend/catalog/sql_features.txt
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@@ -633,7 +633,7 @@ X034 XMLAgg YES
X035 XMLAgg: ORDER BY option YES
X036 XMLComment YES
X037 XMLPI YES
X038 XMLText NO
X038 XMLText YES supported except for RETURNING
X040 Basic table mapping YES
X041 Basic table mapping: null absent YES
X042 Basic table mapping: null as nil YES