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diff --git a/doc/field-structure.xml b/doc/field-structure.xml
index bf02d35..b9fe2ed 100644
--- a/doc/field-structure.xml
+++ b/doc/field-structure.xml
@@ -1,5 +1,4 @@
  <chapter id="fields-and-charsets">
-  <!-- $Id: field-structure.xml,v 1.13 2007-12-19 09:30:29 adam Exp $ -->
   <title>Field Structure and Character Sets
   </title>
   
@@ -22,10 +21,10 @@
   </para>
 
   <para>
-   Zebra 1.3 and Zebra 2.0 series require that the field type is
-   a single character, e.g. <literal>w</literal> (for word), and
-   <literal>p</literal> for phrase. Zebra 2.1 allows field types to
-   be any string. This allows for greater flexibility - in particular
+   Zebra 1.3 and Zebra versions 2.0.18 and earlier required that the field
+   type is a single character, e.g. <literal>w</literal> (for word), and
+   <literal>p</literal> for phrase. Zebra 2.0.20 and later allow field types 
+   to be any string. This allows for greater flexibility - in particular
    per-locale (language) fields can be defined.
   </para>
 
@@ -137,7 +136,7 @@
       </listitem></varlistentry>
     </variablelist>
    </para>
-   <example>
+   <example id="field-types">
     <title>Field types</title>
     <para>
      Following are three excerpts of the standard
@@ -480,7 +479,7 @@
      Use the yaz-icu program to test your icuchain rules.
     </para>
    </tip>
-   <example><title>Indexing Greek text</title>
+   <example id="indexing-greek-example"><title>Indexing Greek text</title>
     <para>
      Consider a system where all "regular" text is to be indexed
      using as Greek (locale: EL).
@@ -513,7 +512,7 @@
     which is an ICU chain version of <filename>default.idx</filename>.
    </para>
 
-   <example><title>MARCXML indexing using ICU</title>
+   <example id="indexing-marcxml-example"><title>MARCXML indexing using ICU</title>
     <para>
      The directory <filename>examples/marcxml</filename> includes
      a complete sample with MARCXML recordst that are DOM XML indexed