<listitem>

<para>

The name of the language that the function is implemented in.

Canbe <literal>SQL</literal>, <literal>C</literal>,

It canbe <literal>sql</literal>, <literal>c</literal>,

<literal>internal</literal>, or the name of a user-defined

procedural language. For backward compatibility,

thenamecan be enclosed by single quotes.

procedural language, e.g. <literal>plpgsql</literal>. Enclosing the

namein single quotes is deprecated and requires matching case.

</para>

</listitem>

</varlistentry>