Import Module Woes

Question

I'm having some problems trying to import one module into another.
Here's the beginning of a module:
module namespace bar='http://ceridwen.us/2006/bar';
import module namespace foo='http://ceridwen.us/2006/foo' at 'file://relative_path/to_foo';
Module bar is imported into the main module with
import module namespace bar='http://ceridwen.us/2006/bar' at 'file://relative_path/to_bar';
Module bar declares functions which use functions from module foo.
I have registered an XmlResolver which handles the relative path URI; it worked fine when there was only one library module. With the import module line in module bar, trying to prepare a query which imports bar throws "Cannot locate the requested module".
If the import module line in bar is changed to an absolute path, then the error is "No namespace for prefix foo".
If the main module prolog imports foo in the second case, xquery throws XQST0034.
Everything works if the main module prolog imports foo and bar, and bar doesn't import foo.
In the first case, it's evident that my XmlResolver isn't being called. I don't understand what's going on in the second case.
The third and fourth case appear to me to violate the requirement that module imports aren't transitive.
Are these bugs, or do I misunderstand the draft recommendation and XmlResolver docs?
Regards,
John Ralls

Answer 1

Hi John,
It looks like you are hitting a few module bugs that we have fixed in the development version of DB XML. The XmlResolver not being called in the first case, and the transitiveness of module imports are both incorrect.
I don't understand why you are getting a namespace error in the second case - but there is good news about that. The development version of DB XML will also give you much better error reporting, including more accurate file, line, and column information in the majority of cases.
I don't know that I can suggest a work around apart from only using one level of modules for the moment. We are actively working on getting the next version of DB XML out the door as I speak...
John