>>>>> "Jesse" == Jesse Wolff <wolff.jesse@xxxxxxxx> writes:

    Jesse> One XSLT Engine engine I'm using, SAP, outputs the
    Jesse> following with the single quotes and the extra brackets and
    Jesse> carriage return: <?xml version="1.0" encoding="utf-8"?>
    Jesse> <!DOCTYPE cXML SYSTEM
    Jesse> 'http://xml.cxml.org/schemas/cXML/1.2.011/cXML.dtd' [ ]>

    Jesse> Is this a valid doctype declaration for an XSLT processor
    Jesse> to generate?

Yes, although it is somewhat perverse.
I say that because XSLT requires that the internal subset is empty for
method="xml".
To have [ followed by ] with no markup declarations between IS an
empty internal subset, and so is legal, but it seems perverse to
generate an empty internal subset.
-- 
Colin Adams
Preston Lancashire