��节才能深入阅读有关服务器端编程语言的材料。
   </P
></DIV
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>35. <A
HREF="extend.html"
>Extending <ACRONYM
CLASS="ACRONYM"
>SQL</ACRONYM
></A
></DT
><DD
><DL
><DT
>35.1. <A
HREF="extend-how.html"
>How Extensibility Works</A
></DT
><DT
>35.2. <A
HREF="extend-type-system.html"
>The <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> Type System</A
></DT
><DT
>35.3. <A
HREF="xfunc.html"
>User-defined Functions</A
></DT
><DT
>35.4. <