diff --git a/doc/src/sgml/Makefile b/doc/src/sgml/Makefile
index 8326c7c673..12997e903c 100644
--- a/doc/src/sgml/Makefile
+++ b/doc/src/sgml/Makefile
@@ -57,6 +57,8 @@ GENERATED_SGML = version.sgml \
 
 ALLSGML := $(wildcard $(srcdir)/*.sgml $(srcdir)/ref/*.sgml) $(GENERATED_SGML)
 
+ALLSVG := $(wildcard $(srcdir)/svg/*.svg)
+
 
 ##
 ## Man pages
@@ -125,10 +127,12 @@ endif
 
 html: html-stamp
 
-html-stamp: stylesheet.xsl postgres.sgml $(ALLSGML)
+html-stamp: stylesheet.xsl postgres.sgml $(ALLSGML) $(ALLSVG)
 	$(XMLLINT) $(XMLINCLUDE) --noout --valid $(word 2,$^)
 	$(XSLTPROC) $(XMLINCLUDE) $(XSLTPROCFLAGS) $(XSLTPROC_HTML_FLAGS) $(wordlist 1,2,$^)
 	cp $(srcdir)/stylesheet.css html/
+	$(MKDIR_P) html/svg
+	cp $(ALLSVG) html/svg
 	touch $@
 
 htmlhelp: stylesheet-hh.xsl postgres.sgml $(ALLSGML)
@@ -136,7 +140,7 @@ htmlhelp: stylesheet-hh.xsl postgres.sgml $(ALLSGML)
 	$(XSLTPROC) $(XMLINCLUDE) $(XSLTPROCFLAGS) $(wordlist 1,2,$^)
 
 # single-page HTML
-postgres.html: stylesheet-html-nochunk.xsl postgres.sgml $(ALLSGML)
+postgres.html: stylesheet-html-nochunk.xsl postgres.sgml $(ALLSGML) $(ALLSVG)
 	$(XMLLINT) $(XMLINCLUDE) --noout --valid $(word 2,$^)
 	$(XSLTPROC) $(XMLINCLUDE) $(XSLTPROCFLAGS) $(XSLTPROC_HTML_FLAGS) -o $@ $(wordlist 1,2,$^)
 
@@ -160,7 +164,7 @@ postgres.pdf:
 	$(XMLLINT) $(XMLINCLUDE) --noout --valid $(word 2,$^)
 	$(XSLTPROC) $(XMLINCLUDE) $(XSLTPROCFLAGS) --stringparam paper.type USletter -o $@ $(wordlist 1,2,$^)
 
-%.pdf: %.fo
+%.pdf: %.fo $(ALLSVG)
 	$(FOP) -fo $< -pdf $@
 
 
@@ -169,7 +173,7 @@ postgres.pdf:
 ##
 
 epub: postgres.epub
-postgres.epub: postgres.sgml $(ALLSGML)
+postgres.epub: postgres.sgml $(ALLSGML) $(ALLSVG)
 	$(XMLLINT) --noout --valid $<
 	$(DBTOEPUB) $<
 
diff --git a/doc/src/sgml/backup.sgml b/doc/src/sgml/backup.sgml
index a73fd4d044..f192ea3b52 100644
--- a/doc/src/sgml/backup.sgml
+++ b/doc/src/sgml/backup.sgml
@@ -16,7 +16,7 @@
   There are three fundamentally different approaches to backing up
   <productname>PostgreSQL</productname> data:
   <itemizedlist>
-   <listitem><para><acronym>SQL</acronym> dump</para></listitem>
+   <listitem><para>Dump into <acronym>SQL INSERT</acronym> syntax or a binary format</para></listitem>
    <listitem><para>File system level backup</para></listitem>
    <listitem><para>Continuous archiving</para></listitem>
   </itemizedlist>
@@ -25,23 +25,28 @@
  </para>
 
  <sect1 id="backup-dump">
-  <title><acronym>SQL</acronym> Dump</title>
+  <title>Dump</title>
 
   <para>
-   The idea behind this dump method is to generate a file with SQL
-   commands that, when fed back to the server, will recreate the
-   database in the same state as it was at the time of the dump.
+   The idea behind this dump technique is to generate a file
+   that, when fed back to the server, will recreate the
+   database in the same state as it was at the time of the dump generation.
+  </para>
+
+  <sect2>
+   <title>Creating the Dump</title>
+  <para>
    <productname>PostgreSQL</productname> provides the utility program
    <xref linkend="app-pgdump"/> for this purpose. The basic usage of this
    command is:
 <synopsis>
 pg_dump <replaceable class="parameter">dbname</replaceable> &gt; <replaceable class="parameter">dumpfile</replaceable>
 </synopsis>
-   As you see, <application>pg_dump</application> writes its result to the
+   As you see, <application>pg_dump</application> in this basic form writes its result to the
    standard output. We will see below how this can be useful.
-   While the above command creates a text file, <application>pg_dump</application>
-   can create files in other formats that allow for parallelism and more
-   fine-grained control of object restoration.
+   While the above command creates a plain-text SQL script, <application>pg_dump</application>
+   can create files also in other, dense binary formats that allow for parallelism and more
+   fine-grained control of object restoration, see: <xref linkend="backup-dump-binary"/>
   </para>
 
   <para>
@@ -100,12 +105,13 @@ pg_dump <replaceable class="parameter">dbname</replaceable> &gt; <replaceable cl
    (Exceptions are those operations that need to operate with an
    exclusive lock, such as most forms of <command>ALTER TABLE</command>.)
   </para>
+  </sect2>
 
   <sect2 id="backup-dump-restore">
    <title>Restoring the Dump</title>
 
    <para>
-    Text files created by <application>pg_dump</application> are intended to
+    Such plain-text SQL scripts created by <application>pg_dump</application> are intended to
     be read in by the <application>psql</application> program. The
     general command form to restore a dump is
 <synopsis>
@@ -121,8 +127,6 @@ psql <replaceable class="parameter">dbname</replaceable> &lt; <replaceable class
     supports options similar to <application>pg_dump</application> for specifying
     the database server to connect to and the user name to use. See
     the <xref linkend="app-psql"/> reference page for more information.
-    Non-text file dumps are restored using the <xref
-    linkend="app-pgrestore"/> utility.
    </para>
 
    <para>
@@ -239,12 +243,12 @@ psql -f <replaceable class="parameter">dumpfile</replaceable> postgres
     Some operating systems have maximum file size limits that cause
     problems when creating large <application>pg_dump</application> output files.
     Fortunately, <application>pg_dump</application> can write to the standard
-    output, so you can use standard Unix tools to work around this
+    output, so you can use standard tools to work around this
     potential problem.  There are several possible methods:
    </para>
 
    <formalpara>
-    <title>Use compressed dumps.</title>
+    <title>Compress dumps.</title>
     <para>
      You can use your favorite compression program, for example
      <application>gzip</application>:
@@ -268,7 +272,7 @@ cat <replaceable class="parameter">filename</replaceable>.gz | gunzip | psql <re
    </formalpara>
 
    <formalpara>
-    <title>Use <command>split</command>.</title>
+    <title>Split dumps.</title>
     <para>
      The <command>split</command> command
      allows you to split the output into smaller files that are
@@ -287,22 +291,57 @@ cat <replaceable class="parameter">filename</replaceable>* | psql <replaceable c
     </para>
    </formalpara>
 
-   <formalpara>
-    <title>Use <application>pg_dump</application>'s custom dump format.</title>
+   <formalpara id="backup-dump-binary">
+    <title>Use binary formats.</title>
+    <para>
+     In addition to the above mentioned plain-text SQL script format <application>pg_dump</application>
+     can create its output files in denser, binary formats: <literal>custom</literal>,
+     <literal>directory</literal>, and <literal>tar</literal>.
+     Dumps in such binary formats are restored using the utility program
+     <xref linkend="app-pgrestore"/> instead of <application>psql</application>.
+    </para>
+   </formalpara>
+
+   <para>
+    <figure id="pg-dump-figure">
+     <title><command>pg_dump</command>, <command>psql</command>, and <command>pg_restore</command>:
+     Dump Formats and Restore Proceedings</title>
+     <indexterm><primary>pg_dump</primary>
+                <secondary>Dump Formats and Restore Proceedings (Figure)</secondary>
+     </indexterm>
+     <indexterm><primary>pg_restore</primary>
+                <secondary>Dump Formats and Restore Proceedings (Figure)</secondary>
+     </indexterm>
+     <indexterm><primary>backup</primary>
+                <secondary>Dump Formats and Restore Proceedings (Figure)</secondary>
+     </indexterm>
+     <mediaobject>
+      <imageobject role="html">
+       <imagedata fileref="svg/pgdump.svg" format="SVG" align="center" />
+      </imageobject>
+      <imageobject role="fo">
+       <imagedata fileref="svg/pgdump.svg" format="SVG" scale="70" />
+      </imageobject>
+     </mediaobject>
+    </figure>
+   </para>
+
     <para>
      If <productname>PostgreSQL</productname> was built on a system with the
-     <application>zlib</application> compression library installed, the custom dump
+     <application>zlib</application> compression library installed, the
+     <literal>custom</literal> dump
      format will compress data as it writes it to the output file. This will
      produce dump file sizes similar to using <command>gzip</command>, but it
      has the added advantage that tables can be restored selectively. The
-     following command dumps a database using the custom dump format:
+     following command dumps a database using the <literal>custom</literal> dump format:
 
 <programlisting>
 pg_dump -Fc <replaceable class="parameter">dbname</replaceable> &gt; <replaceable class="parameter">filename</replaceable>
 </programlisting>
 
-     A custom-format dump is not a script for <application>psql</application>, but
-     instead must be restored with <application>pg_restore</application>, for example:
+     As mentioned above dumps in <literal>custom</literal> format are binary
+     and not plain-text SQL scripts, they must be restored with <application>pg_restore</application>
+     instead of <application>psql</application>, for example:
 
 <programlisting>
 pg_restore -d <replaceable class="parameter">dbname</replaceable> <replaceable class="parameter">filename</replaceable>
@@ -311,11 +350,10 @@ pg_restore -d <replaceable class="parameter">dbname</replaceable> <replaceable c
      See the <xref linkend="app-pgdump"/> and <xref
      linkend="app-pgrestore"/> reference pages for details.
     </para>
-   </formalpara>
 
    <para>
     For very large databases, you might need to combine <command>split</command>
-    with one of the other two approaches.
+    with one of the other approaches.
    </para>
 
    <formalpara>
@@ -325,15 +363,16 @@ pg_restore -d <replaceable class="parameter">dbname</replaceable> <replaceable c
      <application>pg_dump</application>'s parallel mode. This will dump
      multiple tables at the same time. You can control the degree of
      parallelism with the <command>-j</command> parameter. Parallel dumps
-     are only supported for the "directory" archive format.
+     are only supported for the <literal>directory</literal> format.
 
 <programlisting>
 pg_dump -j <replaceable class="parameter">num</replaceable> -F d -f <replaceable class="parameter">out.dir</replaceable> <replaceable class="parameter">dbname</replaceable>
 </programlisting>
 
      You can use <command>pg_restore -j</command> to restore a dump in parallel.
-     This will work for any archive of either the "custom" or the "directory"
-     archive mode, whether or not it has been created with <command>pg_dump -j</command>.
+     This will work for any dump output of either the <literal>custom</literal>
+     or the <literal>directory</literal> 
+     format, whether or not it has been created with <command>pg_dump -j</command>.
     </para>
    </formalpara>
   </sect2>
diff --git a/doc/src/sgml/docguide.sgml b/doc/src/sgml/docguide.sgml
index 0608b8c612..5ccc24833e 100644
--- a/doc/src/sgml/docguide.sgml
+++ b/doc/src/sgml/docguide.sgml
@@ -389,21 +389,21 @@ ADDITIONAL_FLAGS='-Xmx1500m'
   <title>Documentation Authoring</title>
 
    <para>
-    The documentation sources are most conveniently modified with an editor
-    that has a mode for editing XML, and even more so if it has some awareness
-    of XML schema languages so that it can know about
-    <productname>DocBook</productname> syntax specifically.
-   </para>
-
-   <para>
-    Note that for historical reasons the documentation source files are named
+    Note that for historical reasons most of the documentation source files are named
     with an extension <filename>.sgml</filename> even though they are now XML
     files.  So you might need to adjust your editor configuration to set the
     correct mode.
    </para>
 
    <sect2>
-    <title>Emacs</title>
+    <title>Textual Parts and Emacs</title>
+
+    <para>
+     The documentation's textual parts are most conveniently modified with an editor
+     that has a mode for editing XML, and even more so if it has some awareness
+     of XML schema languages so that it can know about
+     <productname>DocBook</productname> syntax specifically.
+    </para>
 
     <para>
      <productname>nXML Mode</productname>, which ships with
@@ -422,6 +422,43 @@ ADDITIONAL_FLAGS='-Xmx1500m'
     </para>
    </sect2>
 
+   <sect2>
+    <title>Graphic Elements</title>
+
+    <para>
+     Graphics - which are a <literal>figure</literal> in Docbook speach
+     - visualize complex situations or behaviour. They provide an
+     additional way for easy understanding what is described in the
+     text parts. Authors create them in <acronym>SVG</acronym> format
+     with any SVG tool of their choice.
+    </para>
+
+    <para>
+     Such tools show two disadvantages: They tend to use their own,
+     unportable enhancements and they produce extremely verbose,
+     unreadable source files. To overcome such drawbacks authors
+     shall create two files for every single graphic: one in
+     <literal>Optimized SVG</literal> format and another one in the
+     tool-specific <acronym>SVG</acronym> format. Both files
+     render to the same graphic. This enables 'diff-ability' (on the
+     <literal>Optimized SVG</literal> file) as well as the use of the
+     powerful tool-specific variant in any future. Both files are
+     stored in the repository, but only the <literal>Optimized SVG</literal>
+     variant is the liable one and included into the
+     <productname>PostgreSQL</productname> documentation.
+    </para>
+
+    <para>
+     This approach as well as the overall directory structure is
+     explained in more detail in <filename>doc/src/sgml/svg/README</filename>.
+     In addition, there are many more hints in
+     <productname>PostgreSQL</productname>'s wiki within the
+     <ulink url="https://wiki.postgresql.org/wiki/Category:SVG">
+     category SVG</ulink>.
+    </para>
+
+   </sect2>
+
  </sect1>
 
 
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 86ff4e5c9e..ef299dd7f3 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -11228,17 +11228,18 @@ table2-mapping
 
    <para>
     As an example of using the output produced by these functions,
-    <xref linkend="xslt-xml-html"/> shows an XSLT stylesheet that
-    converts the output of
+    the following <xref linkend="xslt-xml-html"/> shows
+    an XSLT stylesheet that converts the output of
     <function>table_to_xml_and_xmlschema</function> to an HTML
     document containing a tabular rendition of the table data.  In a
     similar manner, the results from these functions can be
     converted into other XML-based formats.
    </para>
 
-   <figure id="xslt-xml-html">
+   <formalpara id="xslt-xml-html" xreflabel="listing">
     <title>XSLT Stylesheet for Converting SQL/XML Output to HTML</title>
-<programlisting><![CDATA[
+    <para>
+    <programlisting><![CDATA[
 <?xml version="1.0"?>
 <xsl:stylesheet version="1.0"
     xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
@@ -11284,7 +11285,8 @@ table2-mapping
 
 </xsl:stylesheet>
 ]]></programlisting>
-   </figure>
+   </para>
+   </formalpara>
   </sect2>
  </sect1>
 
diff --git a/doc/src/sgml/gin.sgml b/doc/src/sgml/gin.sgml
index cc7cd1ed2c..7e49254afe 100644
--- a/doc/src/sgml/gin.sgml
+++ b/doc/src/sgml/gin.sgml
@@ -453,6 +453,23 @@
   key values for different columns can be of different types.
  </para>
 
+ <figure id="gin-implementation-figure">
+  <title>GIN Overview</title>
+  <indexterm>
+   <primary>index</primary>
+   <secondary>GIN</secondary>
+   <tertiary>GIN (Figure)</tertiary>
+  </indexterm>
+  <mediaobject>
+   <imageobject role="html">
+    <imagedata fileref="svg/gin.svg" format="SVG" align="center" />
+   </imageobject>
+   <imageobject role="fo">
+    <imagedata fileref="svg/gin.svg" format="SVG" scale="70" />
+   </imageobject>
+  </mediaobject>
+ </figure>
+
  <sect2 id="gin-fast-update">
   <title>GIN Fast Update Technique</title>
 
diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml
index cbdad0c3fb..d630366a9a 100644
--- a/doc/src/sgml/storage.sgml
+++ b/doc/src/sgml/storage.sgml
@@ -776,6 +776,19 @@ data. Empty in ordinary tables.</entry>
 </tgroup>
 </table>
 
+ <figure id="page-layout-figure">
+  <title>Overall Page Layout</title>
+  <indexterm><primary>Page Layout (Figure)</primary></indexterm>
+  <mediaobject>
+   <imageobject role="html">
+    <imagedata fileref="svg/pagelayout.svg" format="SVG" align="center" />
+   </imageobject>
+   <imageobject role="fo">
+    <imagedata fileref="svg/pagelayout.svg" format="SVG" scale="70" />
+   </imageobject>
+  </mediaobject>
+ </figure>
+
  <para>
 
   The first 24 bytes of each page consists of a page header
diff --git a/doc/src/sgml/stylesheet-html-nochunk.xsl b/doc/src/sgml/stylesheet-html-nochunk.xsl
index ffd2012e91..9e756708f5 100644
--- a/doc/src/sgml/stylesheet-html-nochunk.xsl
+++ b/doc/src/sgml/stylesheet-html-nochunk.xsl
@@ -9,4 +9,27 @@
 <xsl:include href="stylesheet-html-common.xsl" />
 <xsl:include href="stylesheet-speedup-xhtml.xsl" />
 
+<!--
+  Integrate SVG and MathML files into the nochunk version (one single HTML file).
+  After migrating to Docbook 5.x this template becomes superfluous.
+-->
+<xsl:template match="imagedata">
+  <xsl:variable name="filename">
+    <xsl:call-template name="mediaobject.filename">
+      <xsl:with-param name="object" select=".."/>
+    </xsl:call-template>
+  </xsl:variable>
+
+  <xsl:choose>
+    <!-- Handle MathML and SVG markup in imagedata -->
+    <xsl:when xmlns:mml="http://www.w3.org/1998/Math/MathML" test="mml:*">
+      <xsl:apply-templates/>
+    </xsl:when>
+    <xsl:when xmlns:svg="http://www.w3.org/2000/svg" test="svg:*">
+      <xsl:apply-templates/>
+    </xsl:when>
+  </xsl:choose>
+  <xsl:copy-of select="document($filename)"/>
+</xsl:template>
+
 </xsl:stylesheet>
diff --git a/doc/src/sgml/svg/README b/doc/src/sgml/svg/README
new file mode 100644
index 0000000000..c4bd61151d
--- /dev/null
+++ b/doc/src/sgml/svg/README
@@ -0,0 +1,93 @@
+<!-- doc/src/sgml/svg/README -->
+
+Graphics in PG ('figure' in Docbook speach) use the SVG
+format. PG stores two different SVG files per graphic in
+the repository: a simple, more generic one to create the
+documentation and a tool-specific one for future modifications
+of the graphic. The reason for this approach and the directory
+layout are explained here.
+
+A more detailed description concerning the creation of graphics
+(compatibility rules, fonts, sizes, colors, general hints,
+tool-specific hints, ...) are listed in the wiki under the
+category 'SVG':
+
+  https://wiki.postgresql.org/wiki/Category:SVG
+
+
+Two files per graphic
+=====================
+
+An author can use any SVG tool of his choice to create SVG graphics.
+However, these tools create tool-specific SVG files which suffer
+from some major disadvantages:
+  - they are tool-specific
+  - they tend to use the tool's own, unportable enhancements  and
+  - they produce extremely verbose, unreadable source files.
+To overcome such disadvantages authors shall store two different
+files per graphic after they have finished their work: one in the
+original tool-specific format and another one in a simple,
+less powerful but portable and short format, which is mostly
+called the 'Optimized SVG' format. This format typically misses
+enhanced features like 'connectors' or 'groups'.
+
+Both files render to the same graphic. Both are stored in the
+repository, but only the 'Optimized SVG' variant is the liable
+one and included into the generated PostgreSQL documentation.
+
+For future versions of the graphic the tool-specific file
+can be used as the basis of enhancements. The 'Optimized SVG'
+file serves for diffs.
+
+The 'Optimized SVG' file is mandatory, the tool-specific
+one is optional.
+
+
+Directory Structure
+===================
+
+The text files, which include the graphics, reside - as usual -
+in doc/src/sgml. The SVG files, which are included by the text
+files and used for the documentation generation, reside in
+doc/src/sgml/, their tool-specific counterpart in subdirectories,
+which reflect the name of the tool:
+
+doc/src/sgml/                # usual text files with extension .sgml
+doc/src/sgml/svg             # SVG files in 'Optimized SVG' format
+doc/src/sgml/svg/inkscape    # SVG files in Inkscape specific format
+doc/src/sgml/svg/<toolname>  # SVG files in the format of another tool
+        ...
+        ...
+
+
+Limitation
+==========
+
+Man pages are created out of files in the sgml/ref/ subdirectory.
+If such a file contains a graphic, the generated man page looks
+a little ugly. Please avoid such situations and include graphics
+only into files of the sgml/ directory.
+
+
+Include graphics in text
+========================
+
+Graphics (<figure> element) can be included in <para> and in many other
+Docbook elements, e.g.:
+
+<para>
+ lorem ipsum ...
+ <figure id="page-layout-figure">
+  <title>Overall Page Layout</title>
+  <indexterm><primary>Page Layout (Figure)</primary></indexterm>
+  <mediaobject>
+   <imageobject role="html">
+    <imagedata fileref="svg/pagelayout.svg" format="SVG" align="center" />
+   </imageobject>
+   <imageobject role="fo">
+    <imagedata fileref="svg/pagelayout.svg" format="SVG" scale="70" />
+   </imageobject>
+  </mediaobject>
+ </figure>
+ lorem ipsum ...
+</para>
diff --git a/doc/src/sgml/svg/gin.svg b/doc/src/sgml/svg/gin.svg
new file mode 100644
index 0000000000..9ea11f8b1f
--- /dev/null
+++ b/doc/src/sgml/svg/gin.svg
@@ -0,0 +1,123 @@
+<svg width="580" height="320" viewBox="0 0 580 320" version="1.1" xmlns="http://www.w3.org/2000/svg">
+  <style type="text/css">
+  .text_small   {font-style:normal;
+                 font-weight:normal;
+                 font-size:11px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_normal  {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_big     {font-style:normal;
+                 font-weight:normal;
+                 font-size:28px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_comment {font-style:italic;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_mono    {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:monospace, monospace;
+                 white-space:pre;
+                 fill:black;
+                }
+  </style>
+  <defs>
+    <marker id="a" markerHeight="10" markerWidth="10" orient="auto" refY="5">
+      <path d="m0 0 10 5-10 5 3-5z"/>
+    </marker>
+  </defs>
+
+  <!-- border and background -->
+  <rect x="1" y="1" width="99.4%" height="99.4%" rx="1%"
+        fill="whitesmoke" stroke="#CCCCCC" /> <!-- fill="hsl(0, 0%, 97%)" stroke="hsl(0, 0%, 80%)" /> -->
+
+  <!-- Meta page -->
+  <rect x="30" y="50" width="80" height="40" fill="white" stroke="black"/>
+  <text class="text_normal" x="32" y="65">Meta page</text>
+
+  <!-- Entry tree -->
+  <rect x="181" y="19" width="209" height="160" fill="white" stroke="black"/>
+  <text class="text_normal" x="186" y="35">Entry tree</text>
+  <path d="m110 70h83" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="206" y="64" width="25" height="10" style="fill:lightgrey" stroke="black"/>
+  <path d="m231 65 11-12" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m231 69 11 9" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m231 73 14 35" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="251" y="39" width="25" height="10" style="fill:lightgrey" stroke="black"/>
+  <rect x="251" y="79" width="25" height="10" style="fill:lightgrey" stroke="black"/>
+  <rect x="251" y="119" width="25" height="10" style="fill:lightgrey" stroke="black"/>
+  <path d="m266 49v18" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m266 89v18" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m276 44 32 -5" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m276 44 32 15" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m276 84 32 8" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m276 124 32 0" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m276 124 32 23" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="320" y="30" width="25" height="10" style="fill:green" stroke="black"/>
+  <rect x="320" y="60" width="25" height="10" style="fill:limegreen" stroke="black"/>
+  <rect x="320" y="90" width="25" height="10" style="fill:green" stroke="black"/>
+  <rect x="320" y="120" width="25" height="10" style="fill:limegreen" stroke="black"/>
+  <rect x="320" y="150" width="25" height="10" style="fill:limegreen" stroke="black"/>
+  <path d="m331 40v6" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m331 70v6" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m331 100v6" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m331 130v6" style="marker-end:url(#a)" stroke="black"/>
+
+  <!-- Posting tree 1 -->
+  <rect x="430" y="10" width="115" height="70" fill="white" stroke="black"/>
+  <text class="text_normal" x="440" y="26">Posting tree</text>
+  <path d="m345 35 83 14" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="440" y="45" width="25" height="10" style="fill:lightgrey" stroke="black"/>
+  <path d="m465 50 30 -9" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m465 50 30 18" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="505" y="35" width="25" height="10" style="fill:limegreen" stroke="black"/>
+  <rect x="505" y="65" width="25" height="10" style="fill:limegreen" stroke="black"/>
+  <path d="m515 47v8" style="marker-end:url(#a)" stroke="black"/>
+
+  <!-- Posting tree 2 -->
+  <rect x="430" y="100" width="115" height="70" fill="white" stroke="black"/>
+  <text class="text_normal" x="440" y="115">Posting tree</text>
+  <path d="m345 95 148 37" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="505" y="130" width="25" height="10" style="fill:limegreen" stroke="black"/>
+
+  <!-- Posting tree 3 -->
+  <rect x="430" y="190" width="115" height="70" fill="white" stroke="black"/>
+  <text class="text_normal" x="440" y="205">Posting tree</text>
+  <path d="m345 95 85 125" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="440" y="225" width="25" height="10" style="fill:lightgrey" stroke="black"/>
+  <path d="m465 230 30 -9" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m465 230 30 18" style="marker-end:url(#a)" stroke="black"/>
+  <rect x="505" y="215" width="25" height="10" style="fill:limegreen" stroke="black"/>
+  <rect x="505" y="245" width="25" height="10" style="fill:limegreen" stroke="black"/>
+  <path d="m515 227v8" style="marker-end:url(#a)" stroke="black"/>
+
+  <!-- Pending list -->
+  <rect x="30" y="215" width="360" height="45" fill="white" stroke="black"/>
+  <text class="text_normal" x="37" y="232">Pending list</text>
+  <path d="m70 90 77 138" style="fill:none;marker-end:url(#a)" stroke="black"/>
+  <rect x="155" y="235" width="25" height="10" style="fill:orangered" stroke="black"/>
+  <rect x="210" y="235" width="25" height="10" style="fill:orangered" stroke="black"/>
+  <rect x="265" y="235" width="25" height="10" style="fill:orangered" stroke="black"/>
+  <rect x="320" y="235" width="25" height="10" style="fill:orangered" stroke="black"/>
+  <path d="m180 240h18" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m235 240h18" style="marker-end:url(#a)" stroke="black"/>
+  <path d="m290 240h18" style="marker-end:url(#a)" stroke="black"/>
+
+  <!-- Explanation -->
+  <rect x="30" y="291" width="25" height="10" fill="green" stroke="black"/>
+  <text class="text_small" x="60" y="300">Pointers to Posting tree</text>
+  <rect x="230" y="291" width="25" height="10" fill="limegreen" stroke="black"/>
+  <text class="text_small" x="260" y="300">Heap pointers (in Posting list or Posting tree)</text>
+
+</svg>
diff --git a/doc/src/sgml/svg/inkscape/gin_inkscape.svg b/doc/src/sgml/svg/inkscape/gin_inkscape.svg
new file mode 100644
index 0000000000..be9a9b4c73
--- /dev/null
+++ b/doc/src/sgml/svg/inkscape/gin_inkscape.svg
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="580" height="320" viewBox="0 0 580 320" version="1.1" id="svg139" sodipodi:docname="gin_Inkscape.svg" inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <metadata id="metadata143">
+    <rdf:RDF>
+      <cc:Work rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <sodipodi:namedview pagecolor="#ffffff" bordercolor="#666666" borderopacity="1" objecttolerance="10" gridtolerance="10" guidetolerance="10" inkscape:pageopacity="0" inkscape:pageshadow="2" inkscape:window-width="640" inkscape:window-height="480" id="namedview141" showgrid="false" inkscape:zoom="2.5793103" inkscape:cx="356.431" inkscape:cy="207.50734" inkscape:current-layer="svg139" />
+  <style type="text/css" id="style2">
+  .text_small   {font-style:normal;
+                 font-weight:normal;
+                 font-size:11px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_normal  {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_big     {font-style:normal;
+                 font-weight:normal;
+                 font-size:28px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_comment {font-style:italic;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_mono    {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:monospace, monospace;
+                 white-space:pre;
+                 fill:black;
+                }
+  </style>
+  <defs id="defs7">
+    <marker id="a" markerHeight="10" markerWidth="10" orient="auto" refY="5">
+      <path d="m0 0 10 5-10 5 3-5z" id="path4" />
+    </marker>
+  </defs>
+  <!-- border and background -->
+  <rect x="1" y="1" width="99.4%" height="99.4%" rx="1%" fill="whitesmoke" stroke="#CCCCCC" id="rect9" />
+  <!-- fill="hsl(0, 0%, 97%)" stroke="hsl(0, 0%, 80%)" /> -->
+  <!-- Meta page -->
+  <rect x="30" y="50" width="80" height="40" fill="white" stroke="black" id="rect11" />
+  <text class="text_normal" x="32" y="65" id="text13">Meta page</text>
+  <!-- Entry tree -->
+  <rect x="181" y="19" width="209" height="160" fill="white" stroke="black" id="rect15" />
+  <text class="text_normal" x="186" y="35" id="text17">Entry tree</text>
+  <path d="m110 70h83" style="marker-end:url(#a)" stroke="black" id="path19" />
+  <rect x="206" y="64" width="25" height="10" style="fill:lightgrey" stroke="black" id="rect21" />
+  <path d="m231 65 11-12" style="marker-end:url(#a)" stroke="black" id="path23" />
+  <path d="m231 69 11 9" style="marker-end:url(#a)" stroke="black" id="path25" />
+  <path d="m231 73 14 35" style="marker-end:url(#a)" stroke="black" id="path27" />
+  <rect x="251" y="39" width="25" height="10" style="fill:lightgrey" stroke="black" id="rect29" />
+  <rect x="251" y="79" width="25" height="10" style="fill:lightgrey" stroke="black" id="rect31" />
+  <rect x="251" y="119" width="25" height="10" style="fill:lightgrey" stroke="black" id="rect33" />
+  <path d="m266 49v18" style="marker-end:url(#a)" stroke="black" id="path35" />
+  <path d="m266 89v18" style="marker-end:url(#a)" stroke="black" id="path37" />
+  <path d="m276 44 32 -5" style="marker-end:url(#a)" stroke="black" id="path39" />
+  <path d="m276 44 32 15" style="marker-end:url(#a)" stroke="black" id="path41" />
+  <path d="m276 84 32 8" style="marker-end:url(#a)" stroke="black" id="path43" />
+  <path d="m276 124 32 0" style="marker-end:url(#a)" stroke="black" id="path45" />
+  <path d="m276 124 32 23" style="marker-end:url(#a)" stroke="black" id="path47" />
+  <rect x="320" y="30" width="25" height="10" style="fill:green" id="rect49" stroke="black" />
+  <rect x="320" y="60" width="25" height="10" style="fill:limegreen" id="rect51" stroke="black" />
+  <rect x="320" y="90" width="25" height="10" style="fill:green" id="rect53" stroke="black" />
+  <rect x="320" y="120" width="25" height="10" style="fill:limegreen" id="rect55" stroke="black" />
+  <rect x="320" y="150" width="25" height="10" style="fill:limegreen" id="rect57" stroke="black" />
+  <path d="m331 40v6" style="marker-end:url(#a)" stroke="black" id="path59" />
+  <path d="m331 70v6" style="marker-end:url(#a)" stroke="black" id="path61" />
+  <path d="m331 100v6" style="marker-end:url(#a)" stroke="black" id="path63" />
+  <path d="m331 130v6" style="marker-end:url(#a)" stroke="black" id="path65" />
+  <!-- Posting tree 1 -->
+  <rect x="430" y="10" width="115" height="70" fill="white" stroke="black" id="rect67" />
+  <text class="text_normal" x="440" y="26" id="text69">Posting tree</text>
+  <path d="m345 35 83 14" style="marker-end:url(#a)" stroke="black" id="path71" />
+  <rect x="440" y="45" width="25" height="10" style="fill:lightgrey" stroke="black" id="rect73" />
+  <path d="m465 50 30 -9" style="marker-end:url(#a)" stroke="black" id="path75" />
+  <path d="m465 50 30 18" style="marker-end:url(#a)" stroke="black" id="path77" />
+  <rect x="505" y="35" width="25" height="10" style="fill:limegreen" stroke="black" id="rect79" />
+  <rect x="505" y="65" width="25" height="10" style="fill:limegreen" stroke="black" id="rect81" />
+  <path d="m515 47v8" style="marker-end:url(#a)" stroke="black" id="path83" />
+  <!-- Posting tree 2 -->
+  <rect x="430" y="100" width="115" height="70" fill="white" stroke="black" id="rect85" />
+  <text class="text_normal" x="440" y="115" id="text87">Posting tree</text>
+  <path d="m345 95 148 37" style="marker-end:url(#a)" stroke="black" id="path89" />
+  <rect x="505" y="130" width="25" height="10" style="fill:limegreen" stroke="black" id="rect91" />
+  <!-- Posting tree 3 -->
+  <rect x="430" y="190" width="115" height="70" fill="white" stroke="black" id="rect93" />
+  <text class="text_normal" x="440" y="205" id="text95">Posting tree</text>
+  <path d="m345 95 85 125" style="marker-end:url(#a)" stroke="black" id="path97" />
+  <rect x="440" y="225" width="25" height="10" style="fill:lightgrey" stroke="black" id="rect99" />
+  <path d="m465 230 30 -9" style="marker-end:url(#a)" stroke="black" id="path101" />
+  <path d="m465 230 30 18" style="marker-end:url(#a)" stroke="black" id="path103" />
+  <rect x="505" y="215" width="25" height="10" style="fill:limegreen" stroke="black" id="rect105" />
+  <rect x="505" y="245" width="25" height="10" style="fill:limegreen" stroke="black" id="rect107" />
+  <path d="m515 227v8" style="marker-end:url(#a)" stroke="black" id="path109" />
+  <!-- Pending list -->
+  <rect x="30" y="215" width="360" height="45" fill="white" stroke="black" id="rect111" />
+  <text class="text_normal" x="37" y="232" id="text113">Pending list</text>
+  <path d="m70 90 77 138" style="fill:none;marker-end:url(#a)" stroke="black" id="path115" />
+  <rect x="155" y="235" width="25" height="10" style="fill:orangered" stroke="black" id="rect117" />
+  <rect x="210" y="235" width="25" height="10" style="fill:orangered" stroke="black" id="rect119" />
+  <rect x="265" y="235" width="25" height="10" style="fill:orangered" stroke="black" id="rect121" />
+  <rect x="320" y="235" width="25" height="10" style="fill:orangered" stroke="black" id="rect123" />
+  <path d="m180 240h18" style="marker-end:url(#a)" stroke="black" id="path125" />
+  <path d="m235 240h18" style="marker-end:url(#a)" stroke="black" id="path127" />
+  <path d="m290 240h18" style="marker-end:url(#a)" stroke="black" id="path129" />
+  <!-- Explanation -->
+  <rect x="30" y="291" width="25" height="10" fill="green" stroke="black" id="rect131" />
+  <text class="text_small" x="60" y="300" id="text133">Pointers to Posting tree</text>
+  <rect x="230" y="291" width="25" height="10" fill="limegreen" stroke="black" id="rect135" />
+  <text class="text_small" x="260" y="300" id="text137">Heap pointers (in Posting list or Posting tree)</text>
+</svg>
diff --git a/doc/src/sgml/svg/inkscape/pagelayout_inkscape.svg b/doc/src/sgml/svg/inkscape/pagelayout_inkscape.svg
new file mode 100644
index 0000000000..5803077781
--- /dev/null
+++ b/doc/src/sgml/svg/inkscape/pagelayout_inkscape.svg
@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="580" height="280" viewBox="0 0 580 280" version="1.1" id="svg53" sodipodi:docname="PageLayout_Inkscape.svg" inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <metadata id="metadata57">
+    <rdf:RDF>
+      <cc:Work rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <sodipodi:namedview pagecolor="#ffffff" bordercolor="#666666" borderopacity="1" objecttolerance="10" gridtolerance="10" guidetolerance="10" inkscape:pageopacity="0" inkscape:pageshadow="2" inkscape:window-width="640" inkscape:window-height="480" id="namedview55" showgrid="false" inkscape:zoom="1.2896552" inkscape:cx="329.04306" inkscape:cy="137.84105" inkscape:current-layer="svg53" />
+  <style type="text/css" id="style2">
+  .text_small   {font-style:normal;
+                 font-weight:normal;
+                 font-size:11px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_normal  {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_big     {font-style:normal;
+                 font-weight:normal;
+                 font-size:28px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_comment {font-style:italic;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_mono    {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:monospace, monospace;
+                 white-space:pre;
+                 fill:black;
+                }
+  </style>
+  <defs id="defs7">
+    <marker id="a" markerHeight="10" markerWidth="10" orient="auto" refY="5">
+      <path d="m0 0 10 5-10 5 3-5z" id="path4" />
+    </marker>
+  </defs>
+  <!-- border and background -->
+  <rect x="1" y="1" width="99.4%" height="99.4%" rx="1%" fill="whitesmoke" stroke="#CCCCCC" id="rect9" />
+  <!-- fill="hsl(0, 0%, 97%)" stroke="hsl(0, 0%, 80%)" /> -->
+  <!-- outer rectangle and texts -->
+  <rect x="20" y="80" width="500" height="150" fill="white" stroke="black" id="rect11" />
+  <text class="text_big" x="178" y="50" id="text13">Page Layout</text>
+  <text class="text_mono" x="540" y="125" transform="rotate(90 540 125)" id="text15">8   k B</text>
+  <text class="text_normal" x="392" y="144" id="text17">Free space</text>
+  <!-- first line -->
+  <rect x="20" y="80" width="90" height="30" fill="lime" stroke="black" id="rect19" />
+  <text class="text_normal" x="30" y="100" id="text21">Header</text>
+  <rect x="110" y="80" width="60" height="30" fill="cornflowerblue" stroke="black" id="rect23" />
+  <text class="text_normal" x="115" y="100" id="text25">ItemId</text>
+  <rect x="170" y="80" width="60" height="30" fill="cornflowerblue" stroke="black" id="rect27" />
+  <text class="text_normal" x="175" y="100" id="text29">ItemId</text>
+  <path d="m235 95h78" style="marker-end:url(#a);stroke-dasharray:5, 5" stroke="black" id="path31" />
+  <path d="m184 105-71 85" style="marker-end:url(#a)" fill="none" stroke="black" id="path33" />
+  <path d="m138 105 202 85" style="marker-end:url(#a)" fill="none" stroke="black" id="path35" />
+  <!-- last line -->
+  <path d="m100 215h-30" style="marker-end:url(#a);stroke-dasharray:5, 5" stroke="black" id="path37" />
+  <rect x="105" y="200" width="245" height="30" style="fill:#80BFFF" stroke="black" id="rect39" />
+  <!-- fill:hsl(210, 100%, 75%) -->
+  <text class="text_normal" x="121" y="220" id="text41">Item</text>
+  <rect x="345" y="200" width="85" height="30" style="fill:#80BFFF" stroke="black" id="rect43" />
+  <!-- fill:hsl(210, 100%, 75%) -->
+  <text class="text_normal" x="352" y="220" id="text45">Item</text>
+  <rect x="430" y="200" width="90" height="30" style="fill:springgreen" stroke="black" id="rect47" />
+  <text class="text_normal" x="440" y="220" id="text49">Special</text>
+  <!-- explanation -->
+  <text class="text_small" x="100" y="260" id="text51">Content grows from start to center and from end to center.</text>
+</svg>
diff --git a/doc/src/sgml/svg/inkscape/pgdump_inkscape.svg b/doc/src/sgml/svg/inkscape/pgdump_inkscape.svg
new file mode 100644
index 0000000000..967ca9966a
--- /dev/null
+++ b/doc/src/sgml/svg/inkscape/pgdump_inkscape.svg
@@ -0,0 +1,102 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" width="580" height="370" viewBox="0 0 580 370" version="1.1" id="svg75" sodipodi:docname="pgDump_Inkscape.svg" inkscape:version="0.92.3 (2405546, 2018-03-11)">
+  <metadata id="metadata79">
+    <rdf:RDF>
+      <cc:Work rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <sodipodi:namedview pagecolor="#ffffff" bordercolor="#666666" borderopacity="1" objecttolerance="10" gridtolerance="10" guidetolerance="10" inkscape:pageopacity="0" inkscape:pageshadow="2" inkscape:window-width="640" inkscape:window-height="480" id="namedview77" showgrid="false" inkscape:zoom="0.57538462" inkscape:cx="-79.946524" inkscape:cy="185" inkscape:current-layer="svg75" />
+  <style type="text/css" id="style2">
+  .text_small   {font-style:normal;
+                 font-weight:normal;
+                 font-size:11px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_normal  {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_big     {font-style:normal;
+                 font-weight:normal;
+                 font-size:28px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_comment {font-style:italic;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:&quot;Open Sans&quot;, sans-serif;
+                 fill:black;
+                }
+  .text_mono    {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:monospace, monospace;
+                 white-space:pre;
+                 fill:black;
+                }
+  </style>
+  <defs id="defs23">
+    <marker id="a" markerHeight="10" markerWidth="10" orient="auto" refY="5">
+      <path d="m0 0 10 5 -10 5 3 -5z" id="path4" />
+    </marker>
+    <linearGradient id="gradient_disc" x1="0%" y1="0%" x2="100%" y2="0%">
+      <stop offset="10%" style="stop-color:white" id="stop7" />
+      <stop offset="90%" style="stop-color:steelblue" id="stop9" />
+    </linearGradient>
+    <symbol id="disc" fill="url(#gradient_disc)" stroke="black">
+      <ellipse cx="52" cy="100" rx="50" ry="12" id="ellipse12" />
+      <!-- bottom -->
+      <!-- hide upper half of bottom. use <rect> instead of <clipPath> to support gradient -->
+      <rect x="2" y="20" width="100" height="80" stroke-width="0" id="rect14" />
+      <ellipse cx="52" cy="20" rx="50" ry="12" id="ellipse16" />
+      <!-- top -->
+      <path d="m2 21 v80" id="path18" />
+      <!-- left  -->
+      <path d="m102 21 v80" id="path20" />
+      <!-- right -->
+    </symbol>
+  </defs>
+  <!-- border and background -->
+  <rect x="1" y="1" width="99.4%" height="99.4%" rx="1%" fill="whitesmoke" stroke="#CCCCCC" id="rect25" />
+  <!-- fill="hsl(0, 0%, 97%)" stroke="hsl(0, 0%, 80%)" /> -->
+  <!-- Original DB -->
+  <g transform="translate(220 10)" id="g33">
+    <use xlink:href="#disc" id="use27" />
+    <text x="25" y="60" class="text_normal" id="text29">Original</text>
+    <text x="18" y="75" class="text_normal" id="text31">Database</text>
+  </g>
+  <text x="20" y="60" class="text_normal" id="text35">pg_dump, plain-text format</text>
+  <path d="m210 70 h-138 v40" fill="none" stroke="black" marker-end="url(#a)" id="path37" />
+  <text x="340" y="60" class="text_normal" id="text39">pg_dump, other formats</text>
+  <path d="m340 70 h155 v40" fill="none" stroke="black" marker-end="url(#a)" id="path41" />
+  <!-- SQL script -->
+  <g transform="translate(20 120)" id="g49">
+    <use xlink:href="#disc" id="use43" />
+    <text x="10" y="60" class="text_normal" id="text45">SQL INSERT</text>
+    <text x="10" y="75" class="text_normal" id="text47">commands</text>
+  </g>
+  <text x="130" y="285" class="text_normal" id="text51">psql</text>
+  <path d="m72 240 v55 h130" fill="none" stroke="black" marker-end="url(#a)" id="path53" />
+  <!-- Binary dump -->
+  <g transform="translate(440 120)" id="g61">
+    <use xlink:href="#disc" id="use55" />
+    <text x="30" y="60" class="text_normal" id="text57">Binary</text>
+    <text x="35" y="75" class="text_normal" id="text59">File(s)</text>
+  </g>
+  <text x="370" y="285" class="text_normal" id="text63">pg_restore</text>
+  <path d="m495 240 v55 h-155" fill="none" stroke="black" marker-end="url(#a)" id="path65" />
+  <!-- New DB -->
+  <g transform="translate(220 230)" id="g73">
+    <use xlink:href="#disc" id="use67" />
+    <text x="20" y="60" class="text_normal" id="text69">Restored</text>
+    <text x="18" y="75" class="text_normal" id="text71">Database</text>
+  </g>
+</svg>
diff --git a/doc/src/sgml/svg/pagelayout.svg b/doc/src/sgml/svg/pagelayout.svg
new file mode 100644
index 0000000000..223fcaf749
--- /dev/null
+++ b/doc/src/sgml/svg/pagelayout.svg
@@ -0,0 +1,74 @@
+<svg width="580" height="280" viewBox="0 0 580 280" version="1.1" xmlns="http://www.w3.org/2000/svg">
+  <style type="text/css">
+  .text_small   {font-style:normal;
+                 font-weight:normal;
+                 font-size:11px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_normal  {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_big     {font-style:normal;
+                 font-weight:normal;
+                 font-size:28px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_comment {font-style:italic;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_mono    {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:monospace, monospace;
+                 white-space:pre;
+                 fill:black;
+                }
+  </style>
+  <defs>
+    <marker id="a" markerHeight="10" markerWidth="10" orient="auto" refY="5">
+      <path d="m0 0 10 5-10 5 3-5z"/>
+    </marker>
+  </defs>
+
+  <!-- border and background -->
+  <rect x="1" y="1" width="99.4%" height="99.4%" rx="1%"
+        fill="whitesmoke" stroke="#CCCCCC" /> <!-- fill="hsl(0, 0%, 97%)" stroke="hsl(0, 0%, 80%)" /> -->
+
+  <!-- outer rectangle and texts -->
+  <rect x="20" y="80" width="500" height="150" fill="white" stroke="black"/>
+  <text class="text_big" x="178" y="50">Page Layout</text>
+  <text class="text_mono" x="540" y="125" transform="rotate(90 540 125)">8   k B</text>
+  <text class="text_normal" x="392" y="144">Free space</text>
+
+  <!-- first line -->
+  <rect x="20" y="80" width="90" height="30" fill="lime" stroke="black"/>
+  <text class="text_normal" x="30" y="100">Header</text>
+  <rect x="110" y="80" width="60" height="30" fill="cornflowerblue" stroke="black"/>
+  <text class="text_normal" x="115" y="100">ItemId</text>
+  <rect x="170" y="80" width="60" height="30" fill="cornflowerblue" stroke="black"/>
+  <text class="text_normal" x="175" y="100">ItemId</text>
+  <path d="m235 95h78" style="marker-end:url(#a);stroke-dasharray:5, 5" stroke="black"/>
+  <path d="m184 105-71 85" style="marker-end:url(#a)" fill="none" stroke="black"/>
+  <path d="m138 105 202 85" style="marker-end:url(#a)" fill="none" stroke="black"/>
+
+  <!-- last line -->
+  <path d="m100 215h-30" style="marker-end:url(#a);stroke-dasharray:5, 5" stroke="black"/>
+  <rect x="105" y="200" width="245" height="30" style="fill:#80BFFF" stroke="black"/> <!-- fill:hsl(210, 100%, 75%) -->
+  <text class="text_normal" x="121" y="220">Item</text>
+  <rect x="345" y="200" width="85" height="30" style="fill:#80BFFF" stroke="black"/>  <!-- fill:hsl(210, 100%, 75%) -->
+  <text class="text_normal" x="352" y="220">Item</text>
+  <rect x="430" y="200" width="90" height="30" style="fill:springgreen" stroke="black"/>
+  <text class="text_normal" x="440" y="220">Special</text>
+
+  <!-- explanation -->
+  <text class="text_small" x="100" y="260">Content grows from start to center and from end to center.</text>
+
+</svg>
diff --git a/doc/src/sgml/svg/pgdump.svg b/doc/src/sgml/svg/pgdump.svg
new file mode 100644
index 0000000000..c327136de4
--- /dev/null
+++ b/doc/src/sgml/svg/pgdump.svg
@@ -0,0 +1,95 @@
+<svg width="580" height="370" viewBox="0 0 580 370" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <style type="text/css">
+  .text_small   {font-style:normal;
+                 font-weight:normal;
+                 font-size:11px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_normal  {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_big     {font-style:normal;
+                 font-weight:normal;
+                 font-size:28px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_comment {font-style:italic;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:"Open Sans", sans-serif;
+                 fill:black;
+                }
+  .text_mono    {font-style:normal;
+                 font-weight:normal;
+                 font-size:14px;
+                 font-family:monospace, monospace;
+                 white-space:pre;
+                 fill:black;
+                }
+  </style>
+  <defs>
+    <marker id="a" markerHeight="10" markerWidth="10" orient="auto" refY="5">
+      <path d="m0 0 10 5 -10 5 3 -5z"/>
+    </marker>
+
+    <linearGradient id="gradient_disc" x1="0%" y1="0%" x2="100%" y2="0%">
+      <stop offset="10%" style="stop-color:white" />
+      <stop offset="90%" style="stop-color:steelblue" />
+    </linearGradient>
+
+    <symbol id="disc" fill="url(#gradient_disc)" stroke="black">
+      <ellipse cx="52" cy="100" rx="50" ry="12" /> <!-- bottom -->
+      <!-- hide upper half of bottom. use <rect> instead of <clipPath> to support gradient -->
+      <rect    x="2" y="20" width="100" height="80" stroke-width="0" />
+      <ellipse cx="52" cy="20" rx="50" ry="12"/> <!-- top -->
+      <path    d="m2 21 v80"/>                   <!-- left  -->
+      <path    d="m102 21 v80"/>                 <!-- right -->
+    </symbol>
+  </defs>
+
+  <!-- border and background -->
+  <rect x="1" y="1" width="99.4%" height="99.4%" rx="1%"
+        fill="whitesmoke" stroke="#CCCCCC" /> <!-- fill="hsl(0, 0%, 97%)" stroke="hsl(0, 0%, 80%)" /> -->
+
+  <!-- Original DB -->
+  <g transform="translate(220 10)">
+    <use xlink:href="#disc" />
+    <text x="25" y="60" class="text_normal">Original</text>
+    <text x="18" y="75" class="text_normal">Database</text>
+  </g>
+  <text x="20" y="60" class="text_normal">pg_dump, plain-text format</text>
+  <path d="m210 70 h-138 v40" fill="none" stroke="black" marker-end="url(#a)"/>
+  <text x="340" y="60" class="text_normal">pg_dump, other formats</text>
+  <path d="m340 70 h155 v40" fill="none" stroke="black" marker-end="url(#a)"/>
+
+  <!-- SQL script -->
+  <g transform="translate(20 120)">
+    <use xlink:href="#disc"/>
+    <text x="10" y="60" class="text_normal">SQL INSERT</text>
+    <text x="10" y="75" class="text_normal">commands</text>
+  </g>
+  <text x="130" y="285" class="text_normal">psql</text>
+  <path d="m72 240 v55 h130" fill="none" stroke="black" marker-end="url(#a)"/>
+
+  <!-- Binary dump -->
+  <g transform="translate(440 120)">
+    <use xlink:href="#disc"/>
+    <text x="30" y="60" class="text_normal">Binary</text>
+    <text x="35" y="75" class="text_normal">File(s)</text>
+  </g>
+  <text x="370" y="285" class="text_normal">pg_restore</text>
+  <path d="m495 240 v55 h-155" fill="none" stroke="black" marker-end="url(#a)"/>
+
+  <!-- New DB -->
+  <g transform="translate(220 230)">
+    <use xlink:href="#disc"/>
+    <text x="20" y="60" class="text_normal">Restored</text>
+    <text x="18" y="75" class="text_normal">Database</text>
+  </g>
+
+</svg>
