Java class 到 XSD

Question

Could someone please tell me what XSD matches this Java class?

public class MyClass {

    private List<String> list1;

    private List<String> list2;

    private XMLGregorianCalendar date;

    // getters and setters
}

I've tried the following, but I'm receiving an One of:attribute, :attributeGroup, :anyAttribute is expected error:

<xs:element name="myClass">
  <xs:complexType>
    <xs:sequence minOccurs="0" maxOccurs="unbounded">
      <xs:element name="list1" type="xs:string"/>
    </xs:sequence>
    <xs:sequence minOccurs="0" maxOccurs="unbounded">
      <xs:element name="list2" type="xs:string"/>
    </xs:sequence>
    <xs:element name="date" nillable="true" type="xs:dateTime"/>
  </xs:complexType>
</xs:element>

So it seems I'm not using the <xs:sequence> tag correctly. Could someone please shed some light? (I'm far from being an expert in XML-related stuff)...

I'm using Spring Boot 1.4.4.RELEASE version with Java 7.

Answer 1

The xs:sequence within a xs:complexType defines a specific order in which an elements children must occur. To create a list of elements you simply use the minOccurs and maxOccurs directly on the xs:element tag you want repeated, as follows:

<xs:element name="myClass">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="list1" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="list2" type="xs:string" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element name="date" nillable="true" type="xs:dateTime"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

This should create the class you expect and require XML such as the following (order of tags matter):

<myClass>
  <list1>a</list1>
  <list1>b</list1>
  <list2>y</list2>
  <list2>z</list2>
  <date>2019-06-26T00:00:00.0000000Z</date>
</myClass>

Placing minOccurs and maxOccurs on the xs:sequence tag requires the entire sequence of elements to be repeated.

Answer 2

I've solved it by myself. Here's the XSD:

<xs:element name="myClass">
  <xs:complexType>
    <xs:sequence>
      <xs:element minOccurs="0" maxOccurs="unbounded" name="list1" type="xs:string"/>
      <xs:element minOccurs="0" maxOccurs="unbounded" name="list2" type="xs:string"/>
      <xs:element name="date" nillable="true" type="xs:dateTime"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>