[castor-dev] MarshallException: requires at least one optional group element?

[Rich Trevor]

Hello,

I have not found anything in the archives that directly addresses this
particular behavior. I'm testing the unmarshal operation in code generated
by sourceGenerator.

Issue: when a xsd:group is included in a sequence, at least one of that
group's elements must be present in the instance file, regardless of whether
all the elements have a minOccurrs="0" attribute, and regardless of whether
the group's sequence element has a minOccurs="0" attributes.

Leaving aside the issue of whether there are better ways to design a
schema...  this appears to be valid schema syntax, (... xmlspy 2004
validates the instance, using its default parser).

I'm moving on after spending some time debugging this, but I thought I'd
make a note of it.

Thanks,

Rich Trevor

##### the message on the MarshallException ###
-error-if-this-is-used- is a required field.

##### this instance causes the MarshallException #####

<?xml version="1.0" encoding="UTF-8"?>
<test xmlns="http://www.foo.org/foo";
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    xsi:schemaLocation="http://www.foo.org/foo C:\tmp\test.xsd">

    <a>A</a>
    <b>B</b>

</test>

##### this instance unmarshalls without error #####

<?xml version="1.0" encoding="UTF-8"?>
<test xmlns="http://www.foo.org/foo";
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    xsi:schemaLocation="http://www.foo.org/foo C:\tmp\test.xsd">

    <a>A</a>
    <b>B</b>
    <c>C</c>

</test>

##### schema file: test.xsd #############

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema
    targetNamespace="http://www.foo.org/foo";
    xmlns:xsd="http://www.w3.org/2001/XMLSchema";
    xmlns="http://www.foo.org/foo";
    elementFormDefault="qualified">

    <xsd:element name="test" type="TestType"/>

    <xsd:complexType name="TestType">
        <xsd:sequence>
            <xsd:group ref="RequiredElementGroup"/>
            <xsd:group ref="OptionalElementGroup"/>
        </xsd:sequence>
    </xsd:complexType>

    <xsd:group name="RequiredElementGroup">
        <xsd:sequence>
            <xsd:element name="a" type="xsd:string"/>
            <xsd:element name="b" type="xsd:string"/>
        </xsd:sequence>
    </xsd:group>

    <xsd:group name="OptionalElementGroup">
        <xsd:sequence>
            <xsd:element name="c" type="xsd:string" minOccurs="0"/>
            <xsd:element name="d" type="xsd:string" minOccurs="0"/>
        </xsd:sequence>
    </xsd:group>
</xsd:schema>


########## unit test code ##########3

    public void testUnmarshal() throws MarshalException, ValidationException
{
        Test t = null;
        try {
            t = (Test)Test.unmarshal(new FileReader(TEST_FNAME));
        }
        catch (FileNotFoundException ex) {
            fail("File not Found: " + TEST_FNAME);
        }
        catch (ValidationException ex) {
            fail("ValidationException: " + ex.getMessage());
        }
        catch (MarshalException ex) {
            fail("MarshalException: " + ex.getMessage());
        }
    }

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