Invalid attribute rejection when element is nillable

[gkryl]

XSD:

<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns="http://www.openuri.org/mySchema" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.openuri.org/mySchema" version="2.0">
	<xsd:element name="purchaseOrder" type="PurchaseOrderType"/>
	<xsd:element name="comment" type="comment_type"/>
	<xsd:complexType name="comment_type">
		<xsd:choice>
			<xsd:element name="annotation" type="xsd:string"/>
			<xsd:element name="note" type="xsd:string"/>
		</xsd:choice>
		<xsd:attribute name="country" type="xsd:string"/>
	</xsd:complexType>
	<xsd:complexType name="PurchaseOrderType">
		<xsd:sequence>
		    <xsd:element name="comment" type="comment_type" nillable="true"/>
		</xsd:sequence>
		<xsd:attribute name="orderDate" type="xsd:date"/>
	</xsd:complexType>
</xsd:schema>

XML: I have to attach my xml file as txt (it is small file, 247 bytes long). This view does not show element when it has attribute xsi:nil="true".

instance.txt

<?xml version="1.0" encoding="UTF-8"?>
<data:purchaseOrder orderDate="2006-10-30" xmlns:data="http://www.openuri.org/mySchema"     
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <comment country="US" xsi:nil="true"/>
</data:purchaseOrder>

Problem:

com.ctc.wstx.exc.WstxValidationException: unexpected attribute "country"

Java's default XSD validator does not report any problems with attribute.

[LucCappellaro]

I have the same issue.

Is it possible that the problem is on the MSV side?

it should only accept empty tag without any attribute.
see XSAcceptor.java

[cowtowncoder]

All validation wrt XML Schema is done indeed by MSV; however, Woodstox parser core will need to feed the content so it is also possible that Woodstox might not be passing information correctly.
So I don't know off-hand which one might be at fault here.