Set properties for pgwide="1" objects.

diff --git a/xsl/params/pgwide.properties.xml b/xsl/params/pgwide.properties.xml
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+<refentry id="pgwide.properties">
+<refnamediv>
+<refname>pgwide.properties</refname>
+<refpurpose>Properties to make a figure or table page wide.
+</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv>
+<src:fragment id='pgwide.properties.frag'>
+<xsl:attribute-set name="pgwide.properties">
+  <xsl:attribute name="start-indent">0pt</xsl:attribute>
+</xsl:attribute-set>
+</src:fragment>
+</refsynopsisdiv>
+
+<refsect1><title>Description</title>
+
+<para>This attribute set is used to set the properties
+that make a figure or table "page wide" in fo output.
+It comes into effect when an attribute <literal>pgwide="1"</literal>
+is used.
+</para>
+
+<para>
+By default, it sets <parameter>start-indent</parameter>
+to <literal>0pt</literal>.
+In a stylesheet that sets the parameter
+<parameter>body.start.indent</parameter>
+to a non-zero value in order to indent body text,
+this attribute set can be used to outdent pgwide
+figures to the left margin.
+</para>
+
+<para>If a document uses a multi-column page layout,
+then this attribute set could try setting <parameter>span</parameter>
+to a value of <literal>all</literal>.  However, this may
+not work with some processors because a span property must be on an
+fo:block that is a direct child of fo:flow.  It may work in
+some processors anyway.
+</para>
+
+</refsect1>
+</refentry>