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https://issues.apache.org/jira/browse/DAFFODIL-669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17911976#comment-17911976
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Steve Lawrence commented on DAFFODIL-669:
-----------------------------------------
Note that in some cases it may be useful to have a complex type with an empty
sequence (e.g. for skipping bits). The workaround for this is to add an second
inner sequence, e.g.:
{code:xml}
<xs:element name="foo" ...>
<xs:complexType>
<xs:sequence>
<xs:sequence />
</xs:sequence>
</xs:complexType>
</xs:element>
{code}
When this bug is fixed, we should add tests to make sure this workaround still
works.
> SDE should occur when empty sequence is the content of a complexType
> --------------------------------------------------------------------
>
> Key: DAFFODIL-669
> URL: https://issues.apache.org/jira/browse/DAFFODIL-669
> Project: Daffodil
> Issue Type: Bug
> Components: Front End
> Reporter: Jessie Chab
> Priority: Minor
> Labels: beginner
>
> According to the spec:
> XML schema does not define an empty sequence that is the content of a complex
> type as effective content so any DFDL annotations on such a construct would
> be ignored. It is a schema definition error if the empty sequence is the
> content of a complex type.
> I set this up in test emptySequenceSDE, but there is no error:
> [info] - test_emptySequenceSDE *** FAILED ***
> {color:red}[info] java.lang.Exception: Expected error. Didn't get one.
> Actual result was <emptySeq></emptySeq>
> {color}
> [info] at
> edu.illinois.ncsa.daffodil.tdml.ParserTestCase.runParseExpectErrors(TDMLRunner.scala:479)
> [info] at
> edu.illinois.ncsa.daffodil.tdml.ParserTestCase.runProcessor(TDMLRunner.scala:402)
> [info] at edu.illinois.ncsa.daffodil.tdml.TestCase.run(TDMLRunner.scala:350)
> [info] at
> edu.illinois.ncsa.daffodil.tdml.DFDLTestSuite.runOneTestWithDataVolumes(TDMLRunner.scala:222)
> [info] at
> edu.illinois.ncsa.daffodil.tdml.DFDLTestSuite.runOneTest(TDMLRunner.scala:213)
> [info] at
> edu.illinois.ncsa.daffodil.section14.sequence_groups.TestSequenceGroups.test_emptySequenceSDE(TestSequenceGroups.scala:77)
> [info] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> [info] at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> [info] at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> [info] at java.lang.reflect.Method.invoke(Method.java:601)
> The test is emptySequenceSDE in the following files:
> daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section14/sequence_groups/SequenceGroup.tdml
> daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section14/sequence_groups/TestSequenceGroupsDebug.scala
> daffodil-test/src/test/scala/edu/illinois/ncsa/daffodil/section14/sequence_groups/TestSequenceGroups.scala
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