About dynamically create Type mapping to xml schema

[grovecai]

Hi, guys

I need to dynamically create type mapping to the below schema:

    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";
    xmlns="http://example.com/IPO";
    targetNamespace="http://example.com/IPO";>
    <xsd:element name="purchaseOrder" type="PurchaseOrder"/>
    <xsd:complexType name="PurchaseOrder">
    <xsd:sequence>
    <xsd:element name="shipTo" type="xsd:string" minOccurs="0"/>
    <xsd:element name="billTo" type="xsd:string" minOccurs="0"/>
    <xsd:element name="items" type="xsd:string" minOccurs="0"
    maxOccurs="unbounded"/>
    </xsd:sequence>
    </xsd:complexType>
    </xsd:schema>

Here is my code:
HelperContext helperContext = SDOUtil.createHelperContext();
DataFactory df = helperContext.getDataFactory();
DataObject typeDef = df.create("commonj.sdo", "Type");
typeDef.set("uri", "http://example.com/IPO";);
typeDef.set("name", "PurchaseOrder");

DataObject propDef = typeDef.createDataObject("property");
propDef.set("name", "shipTo");
propDef.set("type",
helperContext.getTypeHelper().getType("commonj.sdo", "String"));

propDef = typeDef.createDataObject("property");
propDef.set("name", "billTo");
propDef.set("type",
helperContext.getTypeHelper().getType("commonj.sdo", "String"));

propDef = typeDef.createDataObject("property");
propDef.set("name", "items");
propDef.set("type",
helperContext.getTypeHelper().getType("commonj.sdo", "String"));
propDef.set("many", true);

Type type = helperContext.getTypeHelper().define(typeDef);
List types = new ArrayList<Type>();
types.add(type);

System.out.println(helperContext.getXSDHelper().generate(types));

The created type actually map to the below schema:

    <xs:schema xmlns:sdo="commonj.sdo" xmlns:sdoJava="commonj.sdo/java"
    xmlns:stn_1="http://example.com/IPO";
    xmlns:xs="http://www.w3.org/2001/XMLSchema";
    attributeFormDefault="qualified" elementFormDefault="qualified"
    targetNamespace="http://example.com/IPO";>
    <xs:complexType abstract="false" name="PurchaseOrder">
    <xs:sequence>
    <xs:element maxOccurs="unbounded" minOccurs="0" name="items"/>
    </xs:sequence>
    <xs:attribute name="shipTo" type="xs:string"/>
    <xs:attribute name="billTo" type="xs:string"/>
    </xs:complexType>
    <xs:element name="purchaseOrder" type="stn_1:PurchaseOrder"/>
    </xs:schema>

What did I missed? I want "shipTo" and "billTo" to be elements contained
in sequence, not as attribute contained directly in complexType. Any
hint may be helpful. Thank you!

Regards,
Grovecai