XML-Schema: Is there a way to make different type elements(each type has more than one Element) pres

[Aray]

There were some different type elements. each of the type has arbitary
amount of Elements, and all those Elements is in ramdon order, How Can I
write the Schema file?

 

[Aray]

I found a way: use <group> as following:

<xs:complexType name="testType">
<xs:choice>
<xs:group ref="testGroup" maxOccurs="unbounded" minOccurs="0" />
</xs:choice>
</xs:complexType>
<xs:group name="testGroup">
<xs:choice>
<xs:element name="element1" />
<xs:element name="element2" />
</xs:choice>
</xs:group>