of the element type that the range type will represent ranges
      of.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">subtype_operator_class</replaceable></term>
    <listitem>
     <para>
      The name of a b-tree operator class for the subtype.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">canonical_function</replaceable></term>
    <listitem>
     <para>
      The name of the canonicalization function for the range type.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">subtype_diff_function</replaceable></term>
    <listitem>
     <para>
      The name of a difference function for the subtype.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">multirange_type_name</replaceable></term>
    <listitem>
     <para>
      The name of the corresponding multirange type.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">input_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that converts data from the type's
      external textual form to its internal form.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">output_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that converts data from the type's
      internal form to its external textual form.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">receive_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that converts data from the type's
      external binary form to its internal form.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">send_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that converts data from the type's
      internal form to its external binary form.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">type_modifier_input_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that converts an array of modifier(s) for the type
      into internal form.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">type_modifier_output_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that converts the internal form of the type's
      modifier(s) to external textual form.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">analyze_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that performs statistical analysis for the
      data type.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">subscript_function</replaceable></term>
    <listitem>
     <para>
      The name of a function that defines what subscripting a value of the
      data type does.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">internallength</replaceable></term>
    <listitem>
     <para>
      A numeric constant that specifies the length in bytes of the new
      type's internal representation.  The default assumption is that
      it is variable-length.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">alignment</replaceable></term>
    <listitem>
     <para>
      The storage alignment requirement of the data type.  If specified,
      it must be <literal>char</literal>, <literal>int2</literal>,
      <literal>int4</literal>, or <literal>double</literal>; the