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Improve documentation about our XML functionality.

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.

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:
Tom Lane
2019-04-01 16:20:22 -04:00
parent b2b819019f
commit 12d46ac392
4 changed files with 476 additions and 95 deletions

View File

@ -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