DOCBOOK: How refering to terms defined in an external glossary

[Giuseppe Greco <giuseppe.greco@fantastic.com>]

Does anybody know how to refere from a book document
(DOCTYPE book)to terms defined in a glossary document
(DOCTYPE glossary)?

Probabli a link is required, but how?

Here's some chunks of my documents:

1. The source document (tech_0000_softreqs.docbook):

<!DOCTYPE book PUBLIC "-//QUXO//DTD DocBook V1.0//EN" [
    <!ENTITY % English "INCLUDE">
    <!ENTITY % projdata.en SYSTEM "TECHDOC//ENTITIES Project Data
V1.0//EN">
    %projdata.en;
]>

<book id="&proj.name;-softreqs" lang="&language;">

  <bookinfo>
    <title>&proj.name;</title>
    <subtitle>Software Requirements</subtitle>

    <authorgroup>
      <author>
        ...
      </author>
    </authorgroup>

    <copyright>
      &copyright.assert;
      &copyright.holder;
    </copyright>

    ...
  </bookinfo>

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

    ...

    <sect1 id="scope">
      <title>Scope</title>

      <para>
        ... The goal of this project is to develop the Regie utility,
        a web-based application allowing registrations to be imported
        from an XML file into the
        <glossterm linkend="broadsphere">BroadSphere</glossterm>
        database, or, viceversa, to be exported from the BroadSphere
        database into an XML file.
      </para>
    </sect1>
  </chapter>
</book>


2. and the glossary document (tech_0000_glossary.docbook):

<!DOCTYPE glossary PUBLIC "-//QUXO//DTD DocBook V1.0//EN" [
    <!ENTITY % English "INCLUDE">
    <!ENTITY % projdata.en SYSTEM "TECHDOC//ENTITIES Project Data
V1.0//EN">
    %projdata.en;
]>

<glossary id="&proj.name;-glossary">
  <title>&proj.name;</title>
  <subtitle>Glossary</subtitle>

  <authorblurb>
    ...
  </authorblurb>

  <!--
  Specify in which order terms are defined. They can be defined in any
  order, but generally alphabetic order provides the greatest
  accessibility.
  -->
  <para>
    This glossary defines terms in alphabetic order.
  </para>

  <glossdiv>
    <title>B</title>

    <glossentry id="broadsphere">
      <glossterm>BroadSphere</glossterm>
      <glossdef>
        <para>
          Platform developed by Fantastic that transmits contents to the
          designed recipients, on schedule, making the most efficient
          use of the available bandwidth.
        </para>
      </glossdef>
    </glossentry>
  </glossdiv>
</glossary>

Thanks.
Giuseppe Greco