[stringtemplate-interest] How best to do recursive hetero template calls?

[Gerald Rosenberg]

Looking for the best/proper way to do a recursive heterogeneous template 
expansion.

The initial attribute is effectively defined as:

public class Element {
     public String type; // can be "TypeA" or "TypeB"
     public Element[ ] children;
     . . .
}

The actual implementation is a fair bit more complex, so before I go too 
far down the wrong path, can anyone please comment on this as being a 
workable approach.  Something better?  Alternates?  Gotchas(how to 
handle first == rest)?

Thanks...

/////////////////////////////////////////////////////////////////////////////
Main(rootElement) ::= <<
<(rootElement.type)(first(rootElement.children), 
rest(rootElement.children))>
}
 >>

TypeA(element, remainder) ::= <<
BEGIN-A
<(first(remainder.children).type)(first(remainder.children), 
rest(remainder.children))>
END-A
 >>

TypeB(element, remainder) ::= <<
BEGIN-B
<(first(remainder.children).type)(first(remainder.children), 
rest(remainder.children))>
END-B
 >>
/////////////////////////////////////////////////////////////////////////////