under which circumstances schema compiler creates a Document class ?

["Weiler, Frank (KBV)" <FW...@KBV.DE>]

Hello !

I would like to know, for which XML Schema constructs the schema compiler creates a Document class for a element or type defined in the schema ?

I have a complex XML schema, which constists of multiple xsd-files, the schema makes extensive use of namespaces and type inheritance (mostly types are derived by restriction). 
In my application I have to parse xml fragments, and if I try to parse the fragment with the appropriate type class, the child elements are not set. If I use the appropriate Document class, all works fine. But there is no Document class for all schema types or elements.

Example (schema fragment only): 
<xs:element name="header" type="vdx_header_typ"/>
<xs:complexType name="vdx_header_typ">
	<xs:complexContent>
		<xs:restriction base="ehd_header_typ">
			<xs:sequence>
				<xs:element ref="id"/>
				<xs:element name="document_type_cd" type="vdx_document_type_cd_typ"/>
				<xs:element ref="service_tmr"/>
				<xs:element name="origination_dttm" type="origination_dttm_typ"/>
				<xs:element name="provider" type="provider_typ" maxOccurs="unbounded"/>
				<xs:element name="interface" type="vdx_interface_typ"/>
			</xs:sequence>
		</xs:restriction>
	</xs:complexContent>
</xs:complexType>

The schema compiler creates two classes: HeaderDocument.java and VdxHeaderTyp.java

A call to 
VdxHeaderTyp head = VdxHeaderTyp.Factory.parse(xmltext);
let all childs unset (null), f.e. 
head.getId() returns null.

A call to
HeaderDocument head = HeaderDocument.Factory.parse(xmltext)
works and I can get the id child with head.getId()

So, what's the problem ?
Regards, Frank

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