On 17.02.23 01:08, Andrey Borodin wrote:
On Thu, Feb 16, 2023 at 2:12 PM Jim Jones<jim.jo...@uni-muenster.de> wrote:
I've looked into the patch. The code looks to conform to usual
expectations.
One nit: this comment should have just one asterisk.
+ /**
Thanks for reviewing! Asterisk removed in v14.
And I have a dumb question: is this function protected from using
external XML namespaces? What if the user passes some xmlns that will
force it to read namespace data from the server filesystem? Or is it
not possible? I see there are a lot of calls to xml_parse() anyway,
but still...
According to the documentation,[1] such validations are not supported.
/"The |xml| type does not validate input values against a document type
declaration (DTD), even when the input value specifies a DTD. There is
also currently no built-in support for validating against other XML
schema languages such as XML Schema."/
But I'll have a look at the code to be sure :)
Best, Jim
1- https://www.postgresql.org/docs/15/datatype-xml.html
From 44825f436e9c8f06a9bea3ed5966ef73bab208a9 Mon Sep 17 00:00:00 2001
From: Jim Jones <jim.jo...@uni-muenster.de>
Date: Thu, 16 Feb 2023 22:36:19 +0100
Subject: [PATCH v14] Add pretty-printed XML output option
This small patch introduces a XML pretty print function.
It basically takes advantage of the indentation feature
of xmlDocDumpFormatMemory from libxml2 to format XML strings.
---
doc/src/sgml/func.sgml | 34 ++++++++++
src/backend/utils/adt/xml.c | 44 ++++++++++++
src/include/catalog/pg_proc.dat | 3 +
src/test/regress/expected/xml.out | 101 ++++++++++++++++++++++++++++
src/test/regress/expected/xml_1.out | 53 +++++++++++++++
src/test/regress/expected/xml_2.out | 101 ++++++++++++++++++++++++++++
src/test/regress/sql/xml.sql | 33 +++++++++
7 files changed, 369 insertions(+)
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index e09e289a43..a621192425 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -14861,6 +14861,40 @@ SELECT xmltable.*
]]></screen>
</para>
</sect3>
+
+ <sect3 id="functions-xml-xmlformat">
+ <title><literal>xmlformat</literal></title>
+
+ <indexterm>
+ <primary>xmlformat</primary>
+ </indexterm>
+
+<synopsis>
+<function>xmlformat</function> ( <type>xml</type> ) <returnvalue>xml</returnvalue>
+</synopsis>
+
+ <para>
+ Converts the given XML value to pretty-printed, indented text.
+ </para>
+
+ <para>
+ Example:
+ <screen><![CDATA[
+SELECT xmlformat('<foo id="x"><bar id="y"><var id="z">42</var></bar></foo>');
+ xmlformat
+--------------------------
+ <foo id="x">
+ <bar id="y">
+ <var id="z">42</var>
+ </bar>
+ </foo>
+
+(1 row)
+
+]]></screen>
+ </para>
+ </sect3>
+
</sect2>
<sect2 id="functions-xml-mapping">
diff --git a/src/backend/utils/adt/xml.c b/src/backend/utils/adt/xml.c
index 079bcb1208..e96cbf65a7 100644
--- a/src/backend/utils/adt/xml.c
+++ b/src/backend/utils/adt/xml.c
@@ -473,6 +473,50 @@ xmlBuffer_to_xmltype(xmlBufferPtr buf)
}
#endif
+Datum
+xmlformat(PG_FUNCTION_ARGS)
+{
+#ifdef USE_LIBXML
+
+ xmlDocPtr doc;
+ xmlChar *xmlbuf = NULL;
+ text *arg = PG_GETARG_TEXT_PP(0);
+ StringInfoData buf;
+ int nbytes;
+
+ doc = xml_parse(arg, XMLOPTION_DOCUMENT, false, GetDatabaseEncoding(), NULL);
+
+ if(!doc)
+ elog(ERROR, "could not parse the given XML document");
+
+ /*
+ * xmlDocDumpFormatMemory (
+ * xmlDocPtr doc, # the XML document
+ * xmlChar **xmlbuf, # the memory pointer
+ * int *nbytes, # the memory length
+ * int format # 1 = node indenting)
+ */
+
+ xmlDocDumpFormatMemory(doc, &xmlbuf, &nbytes, 1);
+
+ xmlFreeDoc(doc);
+
+ if(!nbytes)
+ elog(ERROR, "could not indent the given XML document");
+
+ initStringInfo(&buf);
+ appendStringInfoString(&buf, (const char *)xmlbuf);
+
+ xmlFree(xmlbuf);
+
+ PG_RETURN_XML_P(stringinfo_to_xmltype(&buf));
+
+#else
+ NO_XML_SUPPORT();
+return 0;
+#endif
+}
+
Datum
xmlcomment(PG_FUNCTION_ARGS)
diff --git a/src/include/catalog/pg_proc.dat b/src/include/catalog/pg_proc.dat
index c0f2a8a77c..54e8a6262a 100644
--- a/src/include/catalog/pg_proc.dat
+++ b/src/include/catalog/pg_proc.dat
@@ -8842,6 +8842,9 @@
{ oid => '3053', descr => 'determine if a string is well formed XML content',
proname => 'xml_is_well_formed_content', prorettype => 'bool',
proargtypes => 'text', prosrc => 'xml_is_well_formed_content' },
+{ oid => '4642', descr => 'Indented text from xml',
+ proname => 'xmlformat', prorettype => 'xml',
+ proargtypes => 'xml', prosrc => 'xmlformat' },
# json
{ oid => '321', descr => 'I/O',
diff --git a/src/test/regress/expected/xml.out b/src/test/regress/expected/xml.out
index 3c357a9c7e..e45116aaa7 100644
--- a/src/test/regress/expected/xml.out
+++ b/src/test/regress/expected/xml.out
@@ -1599,3 +1599,104 @@ SELECT * FROM XMLTABLE('.' PASSING XMLELEMENT(NAME a) columns a varchar(20) PATH
<foo/> | <foo/>
(1 row)
+-- XML format: single line XML string
+SELECT xmlformat('<breakfast_menu id="42"><food type="discounter"><name>Belgian Waffles</name><price>$5.95</price><description>Two of our famous Belgian Waffles with plenty of real maple syrup</description><calories>650</calories></food></breakfast_menu>');
+ xmlformat
+--------------------------------------------------------------------------------------------------
+ <breakfast_menu id="42"> +
+ <food type="discounter"> +
+ <name>Belgian Waffles</name> +
+ <price>$5.95</price> +
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>+
+ <calories>650</calories> +
+ </food> +
+ </breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes
+SELECT xmlformat('<breakfast_menu id="73"> <food type="organic" class="fancy"> <name>Belgian Waffles</name> <price>$15.95</price>
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>
+<calories>650</calories> </food> </breakfast_menu> ');
+ xmlformat
+--------------------------------------------------------------------------------------------------
+ <breakfast_menu id="73"> +
+ <food type="organic" class="fancy"> +
+ <name>Belgian Waffles</name> +
+ <price>$15.95</price> +
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>+
+ <calories>650</calories> +
+ </food> +
+ </breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes, using a namespace
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <meal:description>Two of our famous Belgian Waffles with plenty of real maple syrup</meal:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+ xmlformat
+------------------------------------------------------------------------------------------------------------
+ <meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; id="73"> +
+ <meal:food type="organic" class="fancy"> +
+ <meal:name>Belgian Waffles</meal:name> +
+ <meal:price>$15.95</meal:price> +
+ <meal:description>Two of our famous Belgian Waffles with plenty of real maple syrup</meal:description>+
+ <meal:calories>650</meal:calories> +
+ </meal:food> +
+ </meal:breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and a comment
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <!-- eat this --> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+ xmlformat
+-------------------------------------------------------------------------------------------------------------
+ <meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73">+
+ <meal:food type="organic" class="fancy"> +
+ <meal:name>Belgian Waffles</meal:name> +
+ <!-- eat this --> +
+ <meal:price>$15.95</meal:price> +
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description> +
+ <meal:calories>650</meal:calories> +
+ </meal:food> +
+ </meal:breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and CDATA
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories><c><![CDATA[<unknown> &"<>!<a>foo</a>]]></c></meal:calories> </meal:food></meal:breakfast_menu>');
+ xmlformat
+-------------------------------------------------------------------------------------------------------------
+ <meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73">+
+ <meal:food type="organic" class="fancy"> +
+ <meal:name>Belgian Waffles</meal:name> +
+ <meal:price>$15.95</meal:price> +
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description> +
+ <meal:calories> +
+ <c><![CDATA[<unknown> &"<>!<a>foo</a>]]></c> +
+ </meal:calories> +
+ </meal:food> +
+ </meal:breakfast_menu> +
+
+(1 row)
+
+-- XML format: NULL parameter
+SELECT xmlformat(NULL);
+ xmlformat
+-----------
+
+(1 row)
+
+\set VERBOSITY terse
+-- XML format: invalid string (whitespaces)
+SELECT xmlformat(' ');
+ERROR: invalid XML document
+-- XML format: empty string
+SELECT xmlformat('');
+ERROR: invalid XML document
+\set VERBOSITY default
diff --git a/src/test/regress/expected/xml_1.out b/src/test/regress/expected/xml_1.out
index 378b412db0..dc3c241a3a 100644
--- a/src/test/regress/expected/xml_1.out
+++ b/src/test/regress/expected/xml_1.out
@@ -1268,3 +1268,56 @@ DETAIL: This functionality requires the server to be built with libxml support.
SELECT * FROM XMLTABLE('.' PASSING XMLELEMENT(NAME a) columns a varchar(20) PATH '"<foo/>"', b xml PATH '"<foo/>"');
ERROR: unsupported XML feature
DETAIL: This functionality requires the server to be built with libxml support.
+-- XML format: single line XML string
+SELECT xmlformat('<breakfast_menu id="42"><food type="discounter"><name>Belgian Waffles</name><price>$5.95</price><description>Two of our famous Belgian Waffles with plenty of real maple syrup</description><calories>650</calories></food></breakfast_menu>');
+ERROR: unsupported XML feature
+LINE 1: SELECT xmlformat('<breakfast_menu id="42"><food type="discou...
+ ^
+DETAIL: This functionality requires the server to be built with libxml support.
+-- XML format: XML string with space, tabs and newline between nodes
+SELECT xmlformat('<breakfast_menu id="73"> <food type="organic" class="fancy"> <name>Belgian Waffles</name> <price>$15.95</price>
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>
+<calories>650</calories> </food> </breakfast_menu> ');
+ERROR: unsupported XML feature
+LINE 1: SELECT xmlformat('<breakfast_menu id="73"> <food type="organ...
+ ^
+DETAIL: This functionality requires the server to be built with libxml support.
+-- XML format: XML string with space, tabs and newline between nodes, using a namespace
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <meal:description>Two of our famous Belgian Waffles with plenty of real maple syrup</meal:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+ERROR: unsupported XML feature
+LINE 1: SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fa...
+ ^
+DETAIL: This functionality requires the server to be built with libxml support.
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and a comment
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <!-- eat this --> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+ERROR: unsupported XML feature
+LINE 1: SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fa...
+ ^
+DETAIL: This functionality requires the server to be built with libxml support.
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and CDATA
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories><c><![CDATA[<unknown> &"<>!<a>foo</a>]]></c></meal:calories> </meal:food></meal:breakfast_menu>');
+ERROR: unsupported XML feature
+LINE 1: SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fa...
+ ^
+DETAIL: This functionality requires the server to be built with libxml support.
+-- XML format: NULL parameter
+SELECT xmlformat(NULL);
+ xmlformat
+-----------
+
+(1 row)
+
+\set VERBOSITY terse
+-- XML format: invalid string (whitespaces)
+SELECT xmlformat(' ');
+ERROR: unsupported XML feature at character 18
+-- XML format: empty string
+SELECT xmlformat('');
+ERROR: unsupported XML feature at character 18
+\set VERBOSITY default
diff --git a/src/test/regress/expected/xml_2.out b/src/test/regress/expected/xml_2.out
index 42055c5003..2bacbde0c6 100644
--- a/src/test/regress/expected/xml_2.out
+++ b/src/test/regress/expected/xml_2.out
@@ -1579,3 +1579,104 @@ SELECT * FROM XMLTABLE('.' PASSING XMLELEMENT(NAME a) columns a varchar(20) PATH
<foo/> | <foo/>
(1 row)
+-- XML format: single line XML string
+SELECT xmlformat('<breakfast_menu id="42"><food type="discounter"><name>Belgian Waffles</name><price>$5.95</price><description>Two of our famous Belgian Waffles with plenty of real maple syrup</description><calories>650</calories></food></breakfast_menu>');
+ xmlformat
+--------------------------------------------------------------------------------------------------
+ <breakfast_menu id="42"> +
+ <food type="discounter"> +
+ <name>Belgian Waffles</name> +
+ <price>$5.95</price> +
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>+
+ <calories>650</calories> +
+ </food> +
+ </breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes
+SELECT xmlformat('<breakfast_menu id="73"> <food type="organic" class="fancy"> <name>Belgian Waffles</name> <price>$15.95</price>
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>
+<calories>650</calories> </food> </breakfast_menu> ');
+ xmlformat
+--------------------------------------------------------------------------------------------------
+ <breakfast_menu id="73"> +
+ <food type="organic" class="fancy"> +
+ <name>Belgian Waffles</name> +
+ <price>$15.95</price> +
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>+
+ <calories>650</calories> +
+ </food> +
+ </breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes, using a namespace
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <meal:description>Two of our famous Belgian Waffles with plenty of real maple syrup</meal:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+ xmlformat
+------------------------------------------------------------------------------------------------------------
+ <meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; id="73"> +
+ <meal:food type="organic" class="fancy"> +
+ <meal:name>Belgian Waffles</meal:name> +
+ <meal:price>$15.95</meal:price> +
+ <meal:description>Two of our famous Belgian Waffles with plenty of real maple syrup</meal:description>+
+ <meal:calories>650</meal:calories> +
+ </meal:food> +
+ </meal:breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and a comment
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <!-- eat this --> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+ xmlformat
+-------------------------------------------------------------------------------------------------------------
+ <meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73">+
+ <meal:food type="organic" class="fancy"> +
+ <meal:name>Belgian Waffles</meal:name> +
+ <!-- eat this --> +
+ <meal:price>$15.95</meal:price> +
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description> +
+ <meal:calories>650</meal:calories> +
+ </meal:food> +
+ </meal:breakfast_menu> +
+
+(1 row)
+
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and CDATA
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories><c><![CDATA[<unknown> &"<>!<a>foo</a>]]></c></meal:calories> </meal:food></meal:breakfast_menu>');
+ xmlformat
+-------------------------------------------------------------------------------------------------------------
+ <meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73">+
+ <meal:food type="organic" class="fancy"> +
+ <meal:name>Belgian Waffles</meal:name> +
+ <meal:price>$15.95</meal:price> +
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description> +
+ <meal:calories> +
+ <c><![CDATA[<unknown> &"<>!<a>foo</a>]]></c> +
+ </meal:calories> +
+ </meal:food> +
+ </meal:breakfast_menu> +
+
+(1 row)
+
+-- XML format: NULL parameter
+SELECT xmlformat(NULL);
+ xmlformat
+-----------
+
+(1 row)
+
+\set VERBOSITY terse
+-- XML format: invalid string (whitespaces)
+SELECT xmlformat(' ');
+ERROR: invalid XML document
+-- XML format: empty string
+SELECT xmlformat('');
+ERROR: invalid XML document
+\set VERBOSITY default
diff --git a/src/test/regress/sql/xml.sql b/src/test/regress/sql/xml.sql
index ddff459297..68ac613475 100644
--- a/src/test/regress/sql/xml.sql
+++ b/src/test/regress/sql/xml.sql
@@ -624,3 +624,36 @@ SELECT * FROM XMLTABLE('*' PASSING '<e>pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n
\x
SELECT * FROM XMLTABLE('.' PASSING XMLELEMENT(NAME a) columns a varchar(20) PATH '"<foo/>"', b xml PATH '"<foo/>"');
+
+-- XML format: single line XML string
+SELECT xmlformat('<breakfast_menu id="42"><food type="discounter"><name>Belgian Waffles</name><price>$5.95</price><description>Two of our famous Belgian Waffles with plenty of real maple syrup</description><calories>650</calories></food></breakfast_menu>');
+
+-- XML format: XML string with space, tabs and newline between nodes
+SELECT xmlformat('<breakfast_menu id="73"> <food type="organic" class="fancy"> <name>Belgian Waffles</name> <price>$15.95</price>
+ <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>
+<calories>650</calories> </food> </breakfast_menu> ');
+
+-- XML format: XML string with space, tabs and newline between nodes, using a namespace
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <meal:description>Two of our famous Belgian Waffles with plenty of real maple syrup</meal:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and a comment
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <!-- eat this --> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories>650</meal:calories> </meal:food></meal:breakfast_menu>');
+
+-- XML format: XML string with space, tabs and newline between nodes, using multiple namespaces and CDATA
+SELECT xmlformat('<meal:breakfast_menu xmlns:meal="http://fancycafe.im/meal/"; xmlns:desc="http://fancycafe.mn/meal/"; id="73"> <meal:food type="organic" class="fancy"> <meal:name>Belgian Waffles</meal:name> <meal:price>$15.95</meal:price>
+ <desc:description>Two of our famous Belgian Waffles with plenty of real maple syrup</desc:description>
+<meal:calories><c><![CDATA[<unknown> &"<>!<a>foo</a>]]></c></meal:calories> </meal:food></meal:breakfast_menu>');
+
+-- XML format: NULL parameter
+SELECT xmlformat(NULL);
+\set VERBOSITY terse
+-- XML format: invalid string (whitespaces)
+SELECT xmlformat(' ');
+
+-- XML format: empty string
+SELECT xmlformat('');
+\set VERBOSITY default
\ No newline at end of file
--
2.25.1
