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The DOM L3 LS tests: infoset03 datatypenormalization (ALL tests) require the schemaValidating implementationAttribute, otherwise createLSParser can raise NOT_SUPPORTED_ERR when asked to create a schema-validating parser.
infoset03 seems to be trying to detect whether schema validation is supported by looking for a null return value from createLSParser when schemaType is xsdNS. However LS says a NOT_SUPPORTED_ERR should be thrown in this case and doesn't mention a null value being permissable. Given that the test is looking for element-level textual content normalisation - a feature not available in DTD or non-validating parsers - this test should indeed be schemaValidating-only.