在Java中使用xml模式创建xml文件

Question

I try to generate a number of xml file which is containing the schema.I use jaxb to make xml file from schema but i did not able to add schema with in this xml.My desired file looks like

<transaction>
  <xs:schema id="transaction" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xs:element name="transaction" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="id">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="in" type="xs:string" minOccurs="0" />
                <xs:element name="sn" type="xs:string" minOccurs="0" />
                <xs:element name="book" type="xs:string" minOccurs="0" />
                <xs:element name="author" type="xs:string" minOccurs="0" />
               </xs:sequence>
            </xs:complexType>
          </xs:element>
          <xs:element name="data">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="dateTime" type="xs:dateTime" minOccurs="0" />
                <xs:element name="key" type="xs:string" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
          <xs:element name="productData">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="dateTime" type="xs:dateTime" minOccurs="0" />
                <xs:element name="key" type="xs:string" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <id>
    <in>abcd</in>
    <sn>1234567</sn>
    <book>computer</book>
    <author>klen</author>
  </id>
  <data>
    <dateTime>2011-06-24T17:08:36.3727674+05:30</dateTime>
    <key>Err</key>
  </data>
</transaction>

but till now i am able to generate xml file look like

<transaction>
      <id>
        <in>abcd</in>
        <sn>1234567</sn>
        <book>computer</book>
        <author>klen</author>
      </id>
      <data>
        <dateTime>2011-06-24T17:08:36.3727674+05:30</dateTime>
        <key>Err</key>
      </data>
</transaction>

I didn't understand how to add this schema under node.is there any way to add this schema under node using jaxb in java.Main part of my code is like

                    transaction.getIdOrDataOrProductData().add(id);
                    transaction.getIdOrDataOrProductData().add(data);
                    transaction.getIdOrDataOrProductData().add(productdata);
                JAXBContext jaxbContext = JAXBContext.newInstance(Transaction.class);
                    Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
            jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,true);
                    jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT,true);
            jaxbMarshaller.marshal(transaction, file);
            jaxbMarshaller.marshal(transaction, System.out);

is there any way to change the code by which i can add schema with xml file.
our application actually check the file structure if it is not look like my given example then it will be deleted,So i should to follow this structure by which it will update the database.Now my question is that how can I add this my xml file using jaxb.

using C# .NET platform it is possible to generate xml file with schema.is it possible in java.

Answer 1

There is nothing in your schema that says that the schema itself should be added to the instance document.

You would need something like:

<xs:element name="transaction" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
  <xs:complexType>
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <!-- Adding an element that can supports the schema definition -->
      <xs:element ref="xs:schema" minOccurs="0" maxOccurs="1"/>
      <!-- and from here on, what you already have : -->
      <xs:element name="id">
        <xs:complexType>
          <xs:sequence>
            <xs:element name="in" type="xs:string" minOccurs="0" />
            <xs:element name="sn" type="xs:string" minOccurs="0" />
            <xs:element name="book" type="xs:string" minOccurs="0" />
            <xs:element name="author" type="xs:string" minOccurs="0" />
           </xs:sequence>
        </xs:complexType>
      </xs:element>
       ...

And then you'd have to insert the schema into your transaction JAXB object for it to show up in your instance document.

Now, I would like to know more about your use case: are you sure you need to do this ? The document itself (the transaction XML) could simply specify the schema it conforms to, and even specify a location eg :

 <transaction xmlns="urn:mytransactionschema"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://www.example.com/transaction.xsd" >

This should give consumers of your instance document the ability to validate the XML better than by including it in the instance doc.

Answer 2

I know using C# in .NET platform you can do this thing, xml file with schema definition can be possible. I think in java it is not possible.