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    <span class="productname">PostgreSQL</span> allows user-defined functions
    to be written in other languages besides SQL and C.  These other
    languages are generically called <em class="firstterm">procedural
    languages</em> (<acronym class="acronym">PL</acronym>s).
    Procedural languages aren't built into the
    <span class="productname">PostgreSQL</span> server; they are offered
    by loadable modules.
    See <a class="xref" href="xplang.html" title="Chapter 41. Procedural Languages">Chapter 41</a> and following chapters for more
    information.
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