Xerces Validator - multiple schemas using xsi:type

[John Powell]

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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