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+<refentry xmlns="http://docbook.org/ns/docbook"
+          xmlns:xlink="http://www.w3.org/1999/xlink"
+          xmlns:xi="http://www.w3.org/2001/XInclude"
+          xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
+          xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+          version="5.0" xml:id="header.column.widths">
+<refmeta>
+<refentrytitle>header.column.widths</refentrytitle>
+<refmiscinfo class="other" otherclass="datatype">string</refmiscinfo>
+</refmeta>
+<refnamediv>
+<refname>header.column.widths</refname>
+<refpurpose>Specify relative widths of header areas</refpurpose>
+</refnamediv>
+
+<refsynopsisdiv><src:fragment xml:id="header.column.widths.frag">
+<xsl:param name="header.column.widths">1 1 1</xsl:param>
+</src:fragment></refsynopsisdiv>
+
+<refsection><info><title>Description</title></info>
+
+<para>Page headers in print output use a three column table
+to position text at the left, center, and right side of
+the header on the page.
+This parameter lets you specify the relative sizes of the
+three columns.  The default value is
+"1 1 1".</para>
+
+<para>The parameter value must be three numbers, separated
+by white space. The first number represents the relative
+width of the inside header for
+double-sided output.  The second number is the relative
+width of the center header.  The third number is the
+relative width of the outside header for
+double-sided output.
+</para>
+<para>For single-sided output, the first number is the
+relative width of left header for left-to-right
+text direction, or the right header for right-to-left
+text direction.  
+The third number is the
+relative width of right header for left-to-right
+text direction, or the left header for right-to-left
+text direction.</para>
+
+<para>The numbers are used to specify the column widths
+for the table that makes up the header area.
+In the FO output, this looks like:
+</para>
+
+<programlisting>
+&lt;fo:table-column column-number="1" 
+    column-width="proportional-column-width(1)"/&gt;
+</programlisting>
+
+<para>
+The <literal>proportional-column-width()</literal>
+function computes a column width by dividing its
+argument by the total of the arguments for all the columns, and
+then multiplying the result by the width of the whole table
+(assuming all the column specs use the function).
+Its argument can be any positive integer or floating point number.
+Zero is an acceptable value, although some FO processors
+may warn about it, in which case using a very small number might
+be more satisfactory.
+</para>
+
+<para>For example, the value "1 2 1" means the center
+header should have twice the width of the other areas.
+A value of "0 0 1" means the entire header area
+is reserved for the right (or outside) header text.
+Note that to keep the center area centered on
+the page, the left and right values must be
+the same. A specification like "1 2 3" means the
+center area is no longer centered on the page
+since the right area is three times the width of the left area.
+</para>
+
+</refsection>
+</refentry>