     |
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" ...>
<xsd:complexType name="type-name">
<xsd:all>
<xsd:element name="element1"/>
<xsd:element name="element2"/>
</xsd:all>
</xsd:complexType>
</schema>
Specifies that the order of the elements is not important.
Can only contain elements.
Use maxOccurs and minOccurs attributes to define the number of times the 'all' should (is allowed to) be repeated.