Commit77b9c50

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doc: document "IS NOT DOCUMENT"

Reported-by: scott.ure@caseware.comDiscussion:https://postgr.es/m/152056505045.4963.16783351661813640274@wrigleys.postgresql.orgAuthor: Euler TaveiraBackpatch-through: 9.3

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Original file line number	Diff line number	Diff line change
`@@ -10159,6 +10159,24 @@ SELECT xmlagg(x) FROM (SELECT * FROM test ORDER BY y DESC) AS tab;`
`10159`	`10159`	`</para>`
`10160`	`10160`	`</sect3>`
`10161`	`10161`
	`10162`	`+ <sect3>`
	`10163`	`+ <title><literal>IS NOT DOCUMENT</literal></title>`
	`10164`	`+`
	`10165`	`+ <indexterm>`
	`10166`	`+ <primary>IS NOT DOCUMENT</primary>`
	`10167`	`+ </indexterm>`
	`10168`	`+`
	`10169`	`+<synopsis>`
	`10170`	`+<replaceable>xml</replaceable> IS NOT DOCUMENT`
	`10171`	`+</synopsis>`
	`10172`	`+`
	`10173`	`+ <para>`
	`10174`	`+ The expression <literal>IS NOT DOCUMENT</literal> returns false if the`
	`10175`	`+ argument XML value is a proper XML document, true if it is not (that is,`
	`10176`	`+ it is a content fragment), or null if the argument is null.`
	`10177`	`+ </para>`
	`10178`	`+ </sect3>`
	`10179`	`+`
`10162`	`10180`	`<sect3 id="xml-exists">`
`10163`	`10181`	`<title><literal>XMLEXISTS</literal></title>`
`10164`	`10182`

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