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https://issues.apache.org/jira/browse/DAFFODIL-2304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17066736#comment-17066736
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Mike Beckerle commented on DAFFODIL-2304:
-----------------------------------------
s6 should be an SDE.
I believe the following is not legal XSD (I checked Walmsley's book XML Schema).
{code:java}
<group name="foo">
<group ref="bar"/> <!-- group ref cannot be the model group of a group def
-->
</group>
{code}
Because this named group has no sequence or choice model group.
By analogy, the DFDL syntax for a hidden group ref is:
{code:java}
<group name="foo2">
<sequence dfdl:hiddenGroupRef="bar2"/> <!-- group ref cannot be the model
group of a group def -->
</group>
{code}
This should also not be allowed. Because you can't change it into an unhidden
group ref.
So you have to put either a sequence or choice inside a group definition.
While this is true of reusable group definitions and references, the following
ARE legal:
{code:java}
<complexType name="fooType">
<group ref="bar"/>
</complexType>
<complexType name="foo2Type">
<sequence dfdl:hiddenGroupRef="bar"/>
</complexType>
{code}
It's not particularly consistent, but these appear to be the rules of XSD.
> hiddenGroupRef in group is dropped during unparse
> -------------------------------------------------
>
> Key: DAFFODIL-2304
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2304
> Project: Daffodil
> Issue Type: Bug
> Affects Versions: 2.5.0
> Reporter: Olabusayo Kilo
> Priority: Major
> Fix For: 2.6.0
>
>
> HiddenGroupRef's in a group without a sequence tag (i.e s6 instead of s5)
> will result in s6 being dropped in an unparse test case (see
> test_ignoredHiddenGroupRefWithNoSequenceParent), with a "DFDL
>
> {code:java}
> <xs:group name="s5">
> <xs:sequence>
> <xs:sequence dfdl:hiddenGroupRef="ex:s4" />
> </xs:sequence>
> </xs:group>
> <xs:group name="s6">
> <xs:sequence dfdl:hiddenGroupRef="ex:s4" />
> </xs:group>
> <xs:element name="e9" dfdl:lengthKind="delimited">
> <xs:complexType>
> <xs:sequence dfdl:separator=",">
> <xs:sequence dfdl:hiddenGroupRef="ex:s6" />
> <xs:element name="g" type="xs:int"/>
> </xs:sequence>
> </xs:complexType>
> </xs:element>
> {code}
> With some preliminary investigating, I narrowed it down to how children are
> extracted with apparentXMLChildren in SequenceGroup.scala. There may be
> implications to changing this that needs to be investigated.
>
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