<result>
   <section shorttitle="How does SGML work?">
       <title>How is SGML and would you recommend it to your grandmother?</title>
       <intro>
          <para>You can break a typical document into three layers: structure,
 content, and style. SGML works by separating these three aspects and
 deals mainly with the relationship between structure and content.</para>
      </intro>
       <topic topicid="top4">
          <title>Structure</title>
          <para>At the heart of an SGML application is a file called the DTD, or
 Document Type Definition. The DTD sets up the structure of a document,
 much like a database schema describes the types of information it
 handles.</para>
          <para>A database schema also defines the relationships between the
 various types of data. Similarly, a DTD specifies <emph>rules</emph>
 to help ensure documents have a consistent, logical structure.</para>
      </topic>
       <topic topicid="top5">
          <title>Content</title>
          <para>Content is the information itself. The method for identifying
 the information and its meaning within this framework is called
 <emph>tagging</emph>. Tagging must
 conform to the rules established in the DTD (see <xref xrefid="top4"/>).</para>
          <graphic graphname="tagexamp"/>
      </topic>
       <topic topicid="top6">
          <title>Style</title>
          <para>SGML does not standardize style or other processing methods for
 information stored in SGML.</para>
      </topic>
   </section>
</result>