Is it allowed to have empty import tag in xsd

Is it allowed to have empty import tag in xsd

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Article ID: KB0083608

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Updated On:

Products Versions
TIBCO BusinessEvents Enterprise Edition -

Description

In one of our xsd files, we have an empty import tag as follows:
<import />
The xsd file passes validation but when we have this xsd file in a BE project, we are getting a runtime exception on a serializing event which is referring to unrelated elements. Example: 
com.tibco.cep.runtime.model.exception.impl.BEExceptionImpl: org.genxdm.xpath.v20.err.ConcreteErrException: [XPTY0019] A step in a path expression (that is not the last step) is returning atomic values, which is not permitted.
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.visit(QmExprAnalyzer.java:1299)
        at org.genxdm.processor.xpath.v20.sa.model.impl.AxisStepExpr.accept(AxisStepExpr.java:34)
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.analyze(QmExprAnalyzer.java:198)
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.visit(QmExprAnalyzer.java:1584)
        at org.genxdm.processor.xpath.v20.sa.model.impl.ApplyOrderingModeQmExpr.accept(ApplyOrderingModeQmExpr.java:26)
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.analyze(QmExprAnalyzer.java:198)
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.visit(QmExprAnalyzer.java:1059)
        at org.genxdm.processor.xpath.v20.sa.model.impl.RelativePathQmExpr.accept(RelativePathQmExpr.java:50)
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.analyze(QmExprAnalyzer.java:198)
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.visit(QmExprAnalyzer.java:563)
        at org.genxdm.processor.xpath.v20.sa.model.impl.FunctionCallQmExpr.accept(FunctionCallQmExpr.java:36)
        at org.genxdm.processor.xpath.v20.factories.QmExprAnalyzer.analyze(QmExprAnalyzer.java:198)
        at org.genxdm.processor.xpath.v20.factories.XPathQmExprCompiler.compile(XPathQmExprCompiler.java:53)
        at org.genxdm.processor.xpath.v20.factories.XPathQmExprCompiler.compile(XPathQmExprCompiler.java:41)
        at org.genxdm.processor.xpath.v20.XPath2Toolkit.prepare(XPath2Toolkit.java:113)
        at com.tibco.be.functions.xpath.XPath2Helper.a(SourceFile:339)
        at com.tibco.be.functions.xpath.XPath2Helper.a(SourceFile:150)
        at com.tibco.be.functions.xpath.XPath2Helper.evalAsString(SourceFile:175)
        at com.tibco.be.functions.xpath.XPathHelper.evalAsString(SourceFile:115)
        at com.tibco.be.functions.xpath.XPathHelper.evalAsString2(SourceFile:131)
        at com.tibco.cep.runtime.session.impl.RuleSessionImpl$4.doTxnWork(RuleSessionImpl.java:1150)
        at com.tibco.cep.kernel.core.rete.BeTransaction.run(SourceFile:141)
        at com.tibco.cep.kernel.core.rete.BeTransaction.execute(SourceFile:101)
        at com.tibco.cep.runtime.session.impl.RuleSessionImpl.preprocessPassthru(RuleSessionImpl.java:1174)
        at com.tibco.cep.runtime.service.cluster.ClusterTaskController$1.doTxnWork(ClusterTaskController.java:78)
        at com.tibco.cep.kernel.core.rete.BeTransaction.run(SourceFile:156)
        at com.tibco.cep.kernel.core.rete.BeTransaction.execute(SourceFile:101)
        at com.tibco.cep.runtime.service.cluster.ClusterTaskController.executeTask(ClusterTaskController.java:103)
        at com.tibco.cep.runtime.scheduler.impl.WorkerBasedControllerV2$WorkerTask.run(WorkerBasedControllerV2.java:521)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at com.tibco.cep.runtime.util.CustomBEManagedThread.run(CustomBEManagedThread.java:24)

Issue/Introduction

Is it allowed to have an empty import tag in an xsd file?

Resolution

An import statement requires either a namespace or a schemaLocation attribute or both. The empty import statement is causing a resolution error while loading the shared resources and this breaks loading of other resources. Reference to a resource which is not loaded successfully, due to the resolution error, may get the exception as reported.
To resolve the issue, remove the empty import statement from the xsd file.
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