Help on jaxb

Question

I am new to JAXB, I would like to seek help from you guys.
my requirement is, I would like to write an xsd schema for the xml file (tree structure )which is given below .
Xml sample:
<data language="English">-----------------1
     <datalink type="navigational" template="templateid">-------------1.1
          <name>String</name>
          <detaildescription>String</detaildescription>
          <image>String</image>
          <datalink type="navigational" template="templateid">-----------1.1.1
               <name>String</name>
               <detaildescription>String</detaildescription>
               <image>String</image>
               <datalink type="terminal" template="templateid">     
                    <name>String</name>
                    <detaildescription>String</detaildescription>
                    <image>String</image>
                    <page>
                         <header>String</header>
                         <shortdescription>String</shortdescription>
                         <image>String</image>
                         <imagedescription>String</imagedescription>
                    </page>
               </datalink>
          </datalink>-------------end of 1.1.1
     </datalink>----------------end of 1.1
     <datalink type="terminal" template="templateid">-------------1.2
          <name>String</name>
          <detaildescription>String</detaildescription>
          <image>String</image>
          <page>
               <header>String</header>
               <shortdescription>String</shortdescription>
               <image>String</image>
               <imagedescription>String</imagedescription>
          </page>
     </datalink>----------end of 1.2
</data>-----------------end of 1
There are basically two nodes, one is navigational which contains description about the node (i.e. name, detaildescription, image) and also information about the child nodes.
Second one is a Terminal node, which is some what similar to leaf node.
Navigational node must contain atleast one terminal node and it can have 'n' number of either navigation node or Terminal nodes (similar to tree structure).
I would like to write an xsd for above mentioned tree structure and would like to use jaxb to create java equivalent objects. I would like to know how can I implement schema for recursive loop (tree structure) and would like to know whether I can use jaxb for this purpose or I have to use anything else?.
Thank you.
Regards,
Ramki.

Answer 1

A schema element with elements with same name and different complexType
generates error:
"Elements with the same name and in the same scope must have the same type."
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE xs:schema PUBLIC '-//W3C//DTD XMLSCHEMA 200102//EN'
'http://www.w3.org/2001/XMLSchema.dtd'
>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="data">
<xs:complexType>
<xs:sequence>
<xs:element name="datalink" type="navigational"/>
<xs:element name="datalink" type="terminal"/>
</xs:sequence>
<xs:attribute name="language"/>
</xs:complexType>
</xs:element>
<xs:complexType name="navigational">
<xs:sequence>
<xs:element name="datalink" type="navigational" minOccurs="0" maxOccurs="1"/>
<xs:element name="datalink" type="terminal" minOccurs="0" maxOccurs="1"/>
<xs:element name="name"/>
<xs:element name="detaildescription"/>
<xs:element name="image"/>
</xs:sequence>
<xs:attribute name="type" type="xs:string"/>
<xs:attribute name="template" type="xs:string"/>
</xs:complexType>
<xs:complexType name="terminal">
<xs:sequence>
<xs:element name="name"/>
<xs:element name="detaildescription"/>
<xs:element name="image"/>
<xs:element name="page">
<xs:complexType>
<xs:sequence>
<xs:element name="header"/>
<xs:element name="shortdescription"/>
<xs:element name="image"/>
<xs:element name="imagedescription"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="type" type="xs:string"/>
<xs:attribute name="template" type="xs:string"/>
</xs:complexType>
</xs:schema>