XML Validation

Hi,
	I have the attached XML file. I want to know if this
file is valid. I will point out some things I am not
to comfortable with.
1)Occurences of many <xsd:schema...> </xsd:schema>
elements in the file. 
Can a file have more than one schema elements?
2)<xsd:element name='BAPIPAREX' nillable='true'
type='RFC:BAPIPAREX' minOccurs='0'
maxOccurs='unbounded'/>
Can you have reference using type='RFC:BAPIPAREX'
syntax? Is RFC: valid?
3)<xsd:complexType name='RFCException'>
    <xsd:sequence>
     <xsd:element name='key' nillable='true'
type='xsd:string'/>
     <xsd:element name='message' nillable='true'
type='xsd:string'/>
     <xsd:element name='exceptionName' nillable='true'
type='xsd:string'/>
    </xsd:sequence>
   </xsd:complexType>
and
 <wsdl:message name='RFCException'>
  <wsdl:part name='parameters'
element='SAP:RFCException'/>
 </wsdl:message>
I am not sure, if this is a duplicate declaration and
hence invalid. Though one of them is inside a schema
and the other is not. 
4)<wsdl:message name='RFCException'>
	<wsdl:part name='parameters'
element='SAP:RFCException'/>
</wsdl:message>

and

<xsd:complexType name='RFCException'>
	<xsd:sequence>
		<xsd:element name='key' nillable='true'
type='xsd:string'/>
		<xsd:element name='message' nillable='true'
type='xsd:string'/>
		<xsd:element name='exceptionName' nillable='true'
type='xsd:string'/>
	</xsd:sequence>
</xsd:complexType>
Again is this thing valid? They seem to be existing in
different namespaces.

5)Is there any xml validator utility in Java. Note I
just want to validate that the file is valid and not
validate a xml file against some schema. Basically
want to catch the above mentioned conditions.
6)Is there any Java based free utility that will
generate the schema for a xml file?

Thanks,
	Nikhil Khedkar

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