text: CREATE EXTENSION xml2;
  
  select query_to_xml('select 1 as x',true,false,'');
  
  select xslt_process( query_to_xml('select x from generate_series(1,5) as
  x',true,false,'')::text,
  $$<xsl:stylesheet version="1.0"
                 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" indent="yes" />
  <xsl:template match="*">
    <xsl:copy>
       <xsl:copy-of select="@*" />
       <xsl:apply-templates />
    </xsl:copy>
  </xsl:template>
  <xsl:template match="comment()|processing-instruction()">
    <xsl:copy />
  </xsl:template>
  </xsl:stylesheet>
  $$::text);
  
  CREATE TABLE xpath_test (id integer NOT NULL, t xml);
  INSERT INTO xpath_test VALUES (1, '<doc><int>1</int></doc>');
  SELECT * FROM xpath_table('id', 't', 'xpath_test', '/doc/int', 'true')
  as t(id int4);
  SELECT * FROM xpath_table('id', 't', 'xpath_test', '/doc/int', 'true')
  as t(id int4, doc int4);
  
  DROP TABLE xpath_test;
  CREATE TABLE xpath_test (id integer NOT NULL, t text);
  INSERT INTO xpath_test VALUES (1, '<doc><int>1</int></doc>');
  SELECT * FROM xpath_table('id', 't', 'xpath_test', '/doc/int', 'true')
  as t(id int4);
  SELECT * FROM xpath_table('id', 't', 'xpath_test', '/doc/int', 'true')
  as t(id int4, doc int4);
  
  create table articles (article_id integer, article_xml xml, date_entered date);
  insert into articles (article_id, article_xml, date_entered)
  values (2, '<article><author>test</author><pages>37</pages></article>', now());
  SELECT * FROM
  xpath_table('article_id',
              'article_xml',
              'articles',
              '/article/author|/article/pages|/article/title',
              'date_entered > ''2003-01-01'' ')
  AS t(article_id integer, author text, page_count integer, title text);
  
  -- this used to fail when invoked a second time
  select xslt_process('<aaa/>',$$<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="@*|node()">
        <xsl:copy>
           <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
     </xsl:template>
  </xsl:stylesheet>$$)::xml;
  
  select xslt_process('<aaa/>',$$<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:template match="@*|node()">
        <xsl:copy>
           <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
     </xsl:template>
  </xsl:stylesheet>$$)::xml;
  
  create table t1 (id integer, xml_data xml);
  insert into t1 (id, xml_data)
  values
  (1, '<attributes><attribute name="attr_1">Some
  Value</attribute></attributes>');
  
  create index idx_xpath on t1 ( xpath_string
  ('/attributes/attribute[@name="attr_1"]/text()', xml_data::text));
  
  SELECT xslt_process('<employee><name>cim</name><age>30</age><pay>400</pay></employee>'::text, $$<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="xml" omit-xml-declaration="yes" indent="yes"/>
    <xsl:strip-space elements="*"/>
    <xsl:param name="n1"/>
    <xsl:param name="n2"/>
    <xsl:param name="n3"/>
    <xsl:param name="n4"/>
    <xsl:param name="n5" select="'me'"/>
    <xsl:template match="*">
      <xsl:element name="samples">
        <xsl:element name="sample">
          <xsl:value-of select="$n1"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n2"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n3"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n4"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n5"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n6"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n7"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n8"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n9"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n10"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n11"/>
        </xsl:element>
        <xsl:element name="sample">
          <xsl:value-of select="$n12"/>
        </xsl:element>
      </xsl:element>
    </xsl:template>
  </xsl:stylesheet>$$::text, 'n1="v1",n2="v2",n3="v3",n4="v4",n5="v5",n6="v6",n7="v7",n8="v8",n9="v9",n10="v10",n11="v11",n12="v12"'::text);
  
  -- possible security exploit
  SELECT xslt_process('<xml><foo>Hello from XML</foo></xml>',
  $$<xsl:stylesheet version="1.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:sax="http://icl.com/saxon"
        extension-element-prefixes="sax">
  
    <xsl:template match="//foo">
      <sax:output href="0wn3d.txt" method="text">
        <xsl:value-of select="'0wn3d via xml2 extension and libxslt'"/>
        <xsl:apply-templates/>
      </sax:output>
    </xsl:template>
  </xsl:stylesheet>$$);
  