<varlistentry id="libpq-pg-diag-message-detail">
          <term><symbol>PG_DIAG_MESSAGE_DETAIL</symbol></term>
          <listitem>
           <para>
            Detail: an optional secondary error message carrying more
            detail about the problem.  Might run to multiple lines.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-message-hint">
          <term><symbol>PG_DIAG_MESSAGE_HINT</symbol></term>
          <listitem>
           <para>
            Hint: an optional suggestion what to do about the problem.
            This is intended to differ from detail in that it offers advice
            (potentially inappropriate) rather than hard facts.  Might
            run to multiple lines.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-statement-position">
          <term><symbol>PG_DIAG_STATEMENT_POSITION</symbol></term>
          <listitem>
           <para>
            A string containing a decimal integer indicating an error cursor
            position as an index into the original statement string.  The
            first character has index 1, and positions are measured in
            characters not bytes.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-internal-position">
          <term><symbol>PG_DIAG_INTERNAL_POSITION</symbol></term>
          <listitem>
           <para>
            This is defined the same as the
            <symbol>PG_DIAG_STATEMENT_POSITION</symbol> field, but it is used
            when the cursor position refers to an internally generated
            command rather than the one submitted by the client.  The
            <symbol>PG_DIAG_INTERNAL_QUERY</symbol> field will always appear when
            this field appears.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-internal-query">
          <term><symbol>PG_DIAG_INTERNAL_QUERY</symbol></term>
          <listitem>
           <para>
            The text of a failed internally-generated command.  This could
            be, for example, an SQL query issued by a PL/pgSQL function.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-context">
          <term><symbol>PG_DIAG_CONTEXT</symbol></term>
          <listitem>
           <para>
            An indication of the context in which the error occurred.
            Presently this includes a call stack traceback of active
            procedural language functions and internally-generated queries.
            The trace is one entry per line, most recent first.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-schema-name">
          <term><symbol>PG_DIAG_SCHEMA_NAME</symbol></term>
          <listitem>
           <para>
            If the error was associated with a specific database object,
            the name of the schema containing that object, if any.
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-table-name">
          <term><symbol>PG_DIAG_TABLE_NAME</symbol></term>
          <listitem>
           <para>
            If the error was associated with a specific table, the name of the
            table.  (Refer to the schema name field for the name of the
            table's schema.)
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-column-name">
          <term><symbol>PG_DIAG_COLUMN_NAME</symbol></term>
          <listitem>
           <para>
            If the error was associated with a specific table column, the name
            of the column.  (Refer to the schema and table name fields to
            identify the table.)
           </para>
          </listitem>
         </varlistentry>

         <varlistentry id="libpq-pg-diag-datatype-name">