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<chapter id="tutorial-advanced">
system. Numerous languages may be used to implement functions and
procedures; most built-in code is implemented in C. The
<quote>basic</quote> loadable procedural language for
- <productname>PostgreSQL</productname> is <xref linkid="plpgsql">.
+ <productname>PostgreSQL</productname> is <xref linkend="plpgsql">.
Numerous other languages may also be used, including <xref
- linkid="plperl">, <xref linkid="pltcl">, and <xref
- linkid="plpython">.
+ linkend="plperl">, <xref linkend="pltcl">, and <xref
+ linkend="plpython">.
</para>
<para> There are several ways that stored procedures are really