Xerces Validator - multiple schemas using xsi:type

[John Powell <jp...@sed.ara.com>]

Dear XERCES-J mailing list,

The following XML Instance file uses a derived type to extend a base type
which are defined in separate schemas. The XSV validator and XML spy are OK
with this syntax, but the Xerces 1_4_1 parser/validator gives me the
following error:
"[Error] instance.xml:4:43: General Schema Error: Type :
http://www.ara.com/ext,derivedModelType does not derive from the type of
element null."

Is this a known problem with the XERCES validator or are the other
validators letting something through that they shouldn't?
Is there a way to specify the same schemas or instance that works with all
validators?

INSTANCE.XML
<?xml version="1.0" encoding="UTF-8"?>
<model xmlns="http://www.ara.com/base" xmlns:ext="http://www.ara.com/ext"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.ara.com/ext ext.xsd ">
	<generic xsi:type="ext:derivedModelType">
		<base_info>base information</base_info>
		<ext:ext_info>extra info for derived type</ext:ext_info>
	</generic>
</model>

BASE.XSD
<?xml version="1.0"?>
<xsd:schema targetNamespace="http://www.ara.com/base"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:bas="http://www.ara.com/base" elementFormDefault="qualified">
	<xsd:element name="model">
		<xsd:complexType>
			<xsd:sequence>
				<xsd:element name="generic" type="bas:MyBaseType"/>
			</xsd:sequence>
		</xsd:complexType>
	</xsd:element>
	<xsd:complexType name="MyBaseType">
		<xsd:sequence>
			<xsd:element name="base_info" type="xsd:string"/>
		</xsd:sequence>
	</xsd:complexType>
</xsd:schema>

EXT.XSD
<?xml version="1.0"?>
<xsd:schema targetNamespace="http://www.ara.com/ext"
xmlns:ext="http://www.ara.com/ext"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:bas="http://www.ara.com/base" xmlns="http://www.ara.com/ext"
elementFormDefault="qualified" attributeFormDefault="unqualified">
	<xsd:import namespace="http://www.ara.com/base" schemaLocation="BASE.xsd"/>
	<xsd:complexType name="derivedModelType">
		<xsd:annotation>
			<xsd:documentation>derives from an element of type from BASE
</xsd:documentation>
		</xsd:annotation>
		<xsd:complexContent>
			<xsd:extension base="bas:MyBaseType">
				<xsd:sequence>
					<xsd:element name="ext_info" type="xsd:string"/>
				</xsd:sequence>
			</xsd:extension>
		</xsd:complexContent>
	</xsd:complexType>
</xsd:schema>

John Powell


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