general external entity reference from a DTD to another one?

[Giorgos Kaltekis]

can I use a reference to a general external entity within a DTD to refer to another DTD?
For example if I declare
<!ENTITY Chapter1 SYSTEM "chapter1.dtd">

can I use the following within a DTD for book, let's say book.dtd :
<!ELEMENT Book (CHAPTER1|CHAPTER2)>
<!ELEMENT CHAPTER1 ("&Chapter1;")>

so that I give the CHAPTER1 element the structure described in chapter1.dtd?


cheers 
George
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