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doc: document "IS NOT DOCUMENT"
Reported-by: scott.ure@caseware.com Discussion: https://postgr.es/m/152056505045.4963.16783351661813640274@wrigleys.postgresql.org Author: Euler Taveira Backpatch-through: 9.3
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@ -10159,6 +10159,24 @@ SELECT xmlagg(x) FROM (SELECT * FROM test ORDER BY y DESC) AS tab;
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</para>
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</para>
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</sect3>
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</sect3>
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<sect3>
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<title><literal>IS NOT DOCUMENT</literal></title>
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<indexterm>
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<primary>IS NOT DOCUMENT</primary>
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</indexterm>
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<synopsis>
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<replaceable>xml</replaceable> IS NOT DOCUMENT
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</synopsis>
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<para>
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The expression <literal>IS NOT DOCUMENT</literal> returns false if the
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argument XML value is a proper XML document, true if it is not (that is,
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it is a content fragment), or null if the argument is null.
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</para>
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</sect3>
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<sect3 id="xml-exists">
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<sect3 id="xml-exists">
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<title><literal>XMLEXISTS</literal></title>
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<title><literal>XMLEXISTS</literal></title>
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