Problems saving XML from Morpho to metacat
When Morpho generates an eml file such as resource, it appends a SYSTEM
reference as part of the doctype. This system refernce is of type file:// .
This reference will almost certainly be different from the SYSTEM attribute
stored in XNL_CATALOG. Somehow Morpho needs to strip out the SYSTEM attribute
before it attempts to submit the document to Matacat.