Blocks within a <sect2>

Hi,

I am working on the PL/pgSQL docs right now and I need a way to
further subdivide blocks within a <sect2> in DocBook.
For example, I have a "Variables and Constants" <sect2> and I want to
have blocks for "Declaring Variables", "Declaring Constants" and
"Assigning Values to Variables". Each with its own header that stands out
as a block. How do I do that in DocBook?

Another thing is how do I declare tha HTML equivalent of a
"<A NAME='blah'>" so I can <link linkend="blah">FooBar</link> somewhere
else?

Thanks,

-Roberto
--
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Roberto Mello - Computer Science, USU - http://www.brasileiro.net
http://www.sdl.usu.edu - Space Dynamics Lab, Web Developer
Bet my floppy's bigger than yours.