Add xml:id's to all sect. and example.

Sponsored by:	Absolight

en_US.ISO8859-1/books/porters-handbook/special/chapter.xml

@@ -1446,7 +1446,7 @@ USE_XORG=	x11 xpm</programlisting>
   <sect1 xml:id="using-gnome">
     <title>Using GNOME</title>
 
-    <sect2>
+    <sect2 xml:id="using-gnome-introduction">
       <title>Introduction</title>
 
       <para>This chapter explains the <acronym>GNOME</acronym>
@@ -1523,7 +1523,7 @@ GLIB_SCHEMAS=	 org.regexxer.gschema.xml
       </note>
     </sect2>
 
-    <sect2>
+    <sect2 xml:id="using-gnome-variables">
       <title>Variables</title>
 
       <para>This section explains which macros are available and how

en_US.ISO8859-1/books/porters-handbook/uses/chapter.xml

@@ -44,25 +44,25 @@
       (<literal>:</literal>).  Multiple arguments are separated by
       commas (<literal>,</literal>).</para>
 
-    <example>
+    <example xml:id="uses-intro-ex1">
       <title>Using Multiple Values</title>
 
       <programlisting>USES=	bison perl</programlisting>
     </example>
 
-    <example>
+    <example xml:id="uses-intro-ex2">
       <title>Adding an Argument</title>
 
       <programlisting>USES=	gmake:lite</programlisting>
     </example>
 
-    <example>
+    <example xml:id="uses-intro-ex3">
       <title>Adding Multiple Arguments</title>
 
       <programlisting>USES=	drupal:7,theme</programlisting>
     </example>
 
-    <example>
+    <example xml:id="uses-intro-ex4">
       <title>Mixing it All Together</title>
 
       <programlisting>USES=	pgsql:9.3+ cpe python:2.7,build</programlisting>
@@ -1220,7 +1220,7 @@ USE_GNOME=	gnomemenus3:build intlhack</programlisting>
       <package role="port">security/heimdal</package>.  For example,
       use <literal>bootstrap,mit</literal>.</para>
 
-    <example>
+    <example xml:id="uses-gssapi-ex1">
       <title>Typical Use</title>
 
       <programlisting>OPTIONS_SINGLE=	GSSAPI