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In order to create feature type mappings upon data store initialization, the app-schema extension parses the XML schemas listed in the mapping configuration file and builds a registry of all attribute, element and types defined there.
Normally, elements and types defined in imported schemas are automatically resolved and added to the registry; however, if a schema defines no element / type and thus makes no reference to the imported schemas other than the import itself (i.e. it is just a collector), the imported schemas are not resolved and the elements / types defined there are not added to the registry, which results in "element XXX not found" exceptions.
This problem has been reported by a user trying to map ELF addresses, and I personally experienced it trying to build a mapping based on GeoSciML 3.2 schemas (pointing to the main geosciml.xsd file, which imports all other schemas).
A test case demonstrating the issue can be found here.
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