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Improve documentation about our XML functionality

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Add a section explaining how our XML features depart from current
versions of the SQL standard.  Update and clarify the descriptions
of some XML functions.

This is a backpatch for branches 10 and 11, taken from Tom's commit
12d46ac392 for 12, then edited to correctly describe behaviors that
are fixed in 12 but still broken in 10 and 11.

Chapman Flack, reviewed by Ryan Lambert

Discussion: https://postgr.es/m/5BD1284C.1010305@anastigmatix.net
Discussion: https://postgr.es/m/5C81F8C0.6090901@anastigmatix.net
Discussion: https://postgr.es/m/CAN-V+g-6JqUQEQZ55Q3toXEN6d5Ez5uvzL4VR+8KtvJKj31taw@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2019-09-12 16:52:03 -03:00
parent 0a8cd4c296
commit 603a28b449
4 changed files with 492 additions and 88 deletions
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6
src/backend/catalog/sql_features.txt
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@ -593,7 +593,7 @@ X085 Predefined namespace prefixes NO
X086 XML namespace declarations in XMLTable NO
X090 XML document predicate YES
X091 XML content predicate NO
X096 XMLExists NO XPath only
X096 XMLExists NO XPath 1.0 only
X100 Host language support for XML: CONTENT option NO
X101 Host language support for XML: DOCUMENT option NO
X110 Host language support for XML: VARCHAR mapping NO
@ -661,11 +661,11 @@ X282 XMLValidate with CONTENT option NO
X283 XMLValidate with SEQUENCE option NO
X284 XMLValidate: NAMESPACE without ELEMENT clause NO
X286 XMLValidate: NO NAMESPACE with ELEMENT clause NO
X300 XMLTable NO XPath only
X300 XMLTable NO XPath 1.0 only
X301 XMLTable: derived column list option YES
X302 XMLTable: ordinality column option YES
X303 XMLTable: column default option YES
X304 XMLTable: passing a context item YES
X304 XMLTable: passing a context item YES must be XML DOCUMENT
X305 XMLTable: initializing an XQuery variable NO
X400 Name and identifier mapping YES
X410 Alter column data type: XML type YES