Compilation error (type mismatch) on xs:choice with just 1 element

[alexandru]

We have an XML with an xs:choice that has only one element in it, like this:

    <xs:complexType name="CreditorReferenceType1Choice">
        <xs:sequence>
            <xs:choice>
                <xs:element name="Cd" type="DocumentType3Code"/>
            </xs:choice>
        </xs:sequence>
    </xs:complexType>

Unfortunately Scalaxb is throwing a compilation error on the generated code:

[error] .../target/scala-2.13/src_managed/main/sbt-scalaxb/.../generated/xmlprotocol.scala:3841:106: type mismatch;
[error]   DataRecord[String|DocumentType3Code]
[error]       ...generated.pacs28v1.CreditorReferenceType1Choice(p1) })

To fix it we just have to delete the choice declaration:

    <xs:complexType name="CreditorReferenceType1Choice">
        <xs:sequence>
             <xs:element name="Cd" type="DocumentType3Code"/>
        </xs:sequence>
    </xs:complexType>

But it would be nice if Scalaxb did this for us, as we'd like to use these XSDs without modification. This is a modified standard schema, originally that type had 2 choices, I guess the authors just deleted one of them 🤷‍♂️

[waleedsamy]

choice element can also has not options as next

<xs:choice/>

I thinks we should not fail in this case.