inserting general entities

Hi everyone,

I am having a really difficult time understanding entities (character and
general).

The DTD in my DocBook document looks like this:

<!DOCTYPE set SYSTEM "C:\studies\tools\dtd\docbookx.dtd" [
	<!ENTITY section1 SYSTEM "section1.xml">
	<!ENTITY section2 SYSTEM "section2.xml">
	<!ENTITY section3 SYSTEM "section3.xml">
]>

However, I have hundreds of these general entities and I would like to place
them externally from my main DocBook XML file. I have tried putting the
entity declarations in "dbgenent.mod" but it doesn't work. I have read both
Norm's and Bob's books but obviously I am missing something.

Thanks,
René