<partintro>
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<para>
<indexterm><primary>entity sets</primary>
  <secondary>characters</secondary></indexterm>
<indexterm><primary>characters</primary>
  <secondary>entity sets</secondary><see>entity sets</see></indexterm>
<indexterm><primary>ISO standards</primary>
  <secondary>entity sets</secondary>
    <tertiary>characters</tertiary></indexterm>
<indexterm><primary>glyphs (Unicode character references)</primary></indexterm>
<indexterm><primary>Unicode character set</primary>
  <secondary>character numbers and reference glyphs</secondary></indexterm>
The reference pages in this section describe each of the <acronym>ISO</acronym> character
entity sets referenced in DocBook.
</para>

<note><title>A Note on Unicode Character References and Glyphs</title>
<para>
Most of the glyphs this reference are from the TmsPF Roman font
by
<ulink url="http://ourworld.compuserve.com/homepages/profirst/homepagx.htm">Production First Software</ulink>. A few glyphs are from
<ulink url="http://www.indigo.ie/egt/celtscript/">Everson Mono</ulink>,
and are provided with the permission of Michael Everson.
</para>
<para>
The Unicode character numbers and reference glyphs in this
section are examples only. Some characters have more than one
Unicode representation and different Unicode characters may be
appropriate in different contexts. Similarly, the glyph images
offer only one of many possible representations for the specified
character.
</para>
<para>
<indexterm><primary>Unicode character set</primary>
  <secondary>Unicode Standard, Version 2.0 (online information)</secondary></indexterm>

Unicode support requires much more than a simple character to glyph
mapping; for more information on Unicode, consult
<citetitle><ulink url="http://www.unicode.org/unicode/uni2book/u2.html">The
Unicode Standard, Version 2.0</ulink></citetitle> and
<citetitle>
<ulink url="http://www.unicode.org/unicode/reports/tr8.html">Unicode
Technical Report #8</ulink></citetitle>, which describes Unicode Version 2.1.
</para>
</note>
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