How do different XQuery products implement modules?Christian Gruen christian.gruen at gmail.com
Thu Oct 16 02:00:27 PDT 2008
Hi Michael, some comments regarding the module implementation in BaseX: > 1. Is the module URI just an arbitrary character string, or does it have > any semantics? ..the module URI is handled as a simple URI instance without special semantics (non-empty, differing from the XML namespace, ..) > 2. Do you allow several different modules in the same query to have the > same module URI? ..yep. > 2a. if so, can different "import module" declarations import different > subsets of these? ..nope. > 3. Can users import a module without specifying a location URI? If so, > how is the module located? ..no; only coders accessing can do so. > 4. If import module specifies a location URI, is it used, and if so how? ..similar to the doc(..) function. > 5. If import module specifies more than one location URI, how are they > used? ..they are all sequentially parsed. > 5b. If multiple location URIs are allowed, what happens if > import module specifies the same location URI more than once? ..the known location URIs are skipped. > 6. What happens when two modules A and B both import module URI M > > 6a. specifying the same location URI ..again, the known location URIs are skipped. > 6b. specifying different location URIs ..if the resulting modules have different contents, everything works fine - see 2) - otherwise, an error will be thrown because of duplicate function/variable declarations. > 6c. without specifying a location URI ..an error will be thrown - see 3) > 7. Is it possible (by means of multiple imports) to create two different > "instances" of the same module in a query, with distinct values of global > variables, or do all imports get the same instance with a common set of > variables? ..all imports share the same instance. Hope this helps, Christian BaseX http://www.basex.org
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