Ensureing sequence of XML tags

Time to selfishly summoning the LazyWeb (hoping this is appropriate)...: a colleague has asked me the following question, and I can't find an explicit, definitive answer. Can anyone help?

Do you know if an XML Schema defines the order of child elements (XML tags) in an XML message.

E.g. does the schema below define that the order of the child elements always will appear in the order shown in the sample XML message below:

Schema:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
<xs:element name="Child1" type="xs:string"/>
<xs:element name="Child2" type="xs:string"/>
<xs:element name="Child3" type="xs:string"/>
<xs:element name="Parent">
<xs:complexType>
<xs:sequence>
<xs:element ref="Child1"/>
<xs:element ref="Child2"/>
<xs:element ref="Child3"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

XML Message:

<?xml version="1.0" encoding="UTF-8"?>
<Parent>
<Child1>A</Child1>
<Child2>B</Child2>
<Child3>C</Child3>
</Parent>

Thanks in advance! (Please post your answer; preferably with supporting URLs; in the comments section below)

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