How to validate XML file with multiple schemas?

[Ali_baba <su...@yahoo.com>]

 I am trying to get a parser (xcerces-c DOM parser) to validate an XML file
that uses 
> a schema which includes another schema definition.  All I 
> want to do is define an attribute in one schema/namespace and 
> reference it as a required attribute in another schema.  I've 
> simplified the example to 3 files: main.xsd includes subMain.xsd, and 
> main.xml is my instance doc.
> 
> main.xsd (define element foo that requires subMain:type attribute):
> <?xml version="1.0" encoding="UTF-8"?>
> <xsd:schema targetNamespace="http://www.main.com/main"
> xmlns:subMain="http://www.subMain.com/subMain" 
> xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
> attributeFormDefault="unqualified">
> 	<xsd:import namespace="http://www.subMain.com/subMain"
> schemaLocation="subMain.xsd"/>
> 	<xsd:element name="foo">
> 		<xsd:complexType>
> 			<xsd:attribute ref="subMain:type" use="required"/>
> 		</xsd:complexType>
> 	</xsd:element>
> </xsd:schema>
> 
> subMain.xsd:
> <?xml version="1.0"?>
> <xsd:schema targetNamespace="http://www.subMain.com/subMain" 
> xmlns:xsd="http://www.w3.org/2001/XMLSchema">
xmlns:anotherSchema = "http://www.anotherSchema.com/anotherSchema" 
<xsd:import namespace="http://www.anotherSchema.com/anotherSchema"
schemaLocation="anotherSchema.xsd"/>
> 	<xsd:attribute name="type" type="xsd:string"/>
> </xsd:schema>
> 
> main.xml:
> <?xml version="1.0" encoding="UTF-8"?>
> <foo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
> xmlns:main="http://www.main.com/main"
> xmlns:subMain="http://www.subMain.com/subMain" 
> xsi:schemaLocation="http://www.main.com/main main.xsd
> http://www.subMain.com/subMain subMain.xsd" 
/>


main.xsd imports subMain.xsd 
subMain.xsd imports anotherSchema.xsd
and so on ...

How do i validate it with xerces-c DOM parser ?? any example would be
helpful.


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