DOCBOOK: How Capitalize xref Text?

How does one indicate the beginning of the text produced by
xref should be capitalized?  For example,

    <para><xref linkend="some-interesting-place"></xref> is a good place
    to start.</para>

should produce something like

    The chapter entitled Foo is a good place to start.

not

    the chapter entitled Foo is a good place to start.

A complete document appears below.

Thank you for your help,
Jeffrey D. Oldham


**************** complete document ****************

<?xml version="1.0"?>

<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
[
  <!ENTITY ExecTest "<classname>ExecTest</classname>">
]>
<article>

 <section id="introduction">
  <title>Introduction</title>

  <para><xref linkend="introduction"></xref> is a good place to
  start.</para>

 </section>

</article>