That sounds like a browser-generated error. Did you try "view source" or curl 
or wget to see the actual response?

I think the immediate problem is that the DOCTYPE ends up XML-escaped. Since it 
wants document-node()*, you might try

    document { '<!DOCTYPE ... >' }, document { <doc/> } 

I'm not sure if that will fix everything, though. You'll end up with something 
like:

<!DOCTYPE ... >
<?xml version="1.0" encoding="UTF-8"?>
<doc/>

That extra <?xml... might cause problems. If so, you'll also need to configure 
the app server to omit the declaration, or tell the module to do so. I think 
the module prolog would be:

    declare option xdmp:output "omit-xml-declaration=yes";

http://docs.marklogic.com/guide/xquery/langoverview#id_71572 also has options 
for setting the public and system doctype, but it seems like the syntax only 
supports literal strings. So it might be tricky to use those in a dynamic way.

-- Mike

On 15 Nov 2012, at 15:20 , Will Thompson <[email protected]> wrote:

> We are trying to extend the REST API to return doctypes for some documents.
> 
> Part of the problem seems to be with the required function signature for GET: 
> document-node()*. This obviously throws a coercion exception when the return 
> value is ('<!DOCTYPE ... >', document{ <doc/> }). So I tried returning 
> nesting the doctype under the document node: document { ('<!DOCTYPE ... 
> >',<doc/>) } - this doesn't throw the exception, but it looks like another 
> one gets caught somewhere, and the page renders a pretty error message:
> 
> "This page contains the following errors:
> 
> error on line 2 at column 1: Document is empty
> 
> Below is a rendering of the page up to the first error."
> 
> The rest of the page is empty. Any suggestions on a good way to do this?
> 
> Thanks,
> 
> Will
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> 

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