How to ensure some mandatory and some optional elements under complextype in xml?

[rohit chawla]

Hi guys,
I am facing problems in making a complex element, which allows both optional as well as mandatory elements.
For the xml below, say h2 is mandatory, while h1 is optional, and the order does not matter.

Case 1:
<root>
<h1/>
<h2/>
</root>

Case 2:
<root>
<h2/>
</root>

Case 3:
<root>
<h2/>
<h1/>
</root>

XSD:

<xs:element name="root">
<xs:complexType>
<xs:sequence minOccurs="1" maxOccurs="unbounded">
<xs:element name="h1" minOccurs="0"></xs:element>
<xs:element name="h2" minOccurs="1" />
</xs:sequence>
</xs:complexType>
</xs:element>

the third case above fails in this xsd, but such case is valid.
I need an xsd that is valid for all the above mentioned cases.

[g tsuji]

Like this or you mean something else.

<xs:element name="root">
    <xs:complexType>
        <xs:all>
            <xs:element name="h1" minOccurs="0" />
            <xs:element name="h2" />
        </xs:all>
    </xs:complexType>
</xs:element>