Declarations : Sequence « XML Schema « XML Tutorial

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XML Tutorial » XML Schema » Sequence 
3. 57. 1.  Declarations
<sequence minOccurs="non negative number" 
          maxOccurs="non negative number or unbounded"

A sample sequence might appear as follows: 

<sequence> 
    <element name="first" type="string" minOccurs="1" maxOccurs="unbounded"/> 
    <element name="middle" type="string" minOccurs="0" maxOccurs="1"/> 
    <element name="last" type="string"/> 
</sequence> 

By utilizing a <sequence> to specify your content model, you indicate that the elements must appear 
  within your instance document in the sequence, or order, specified. 

For example, the following would be legal: 

<first>first</first> 
<middle>middle</middle> 
<last>last</last> 

The following, however, would be illegal: 

<last>last</last> 
<middle>middle</middle> 
<first>first</first>
3. 57. Sequence
3. 57. 1.  Declarations
3. 57. 2. Requiring Elements to Appear in Sequence
3. 57. 3. The minOccurs and maxOccurs attributes can be used with compositors
3. 57. 4. The sequence compositor allows you to require a sequence for child elements in a content model
3. 57. 5. Fixed Order: All Elements Required
3. 57. 6. Fixed Order Optional Elements
3. 57. 7. Requiring Repeating Sequences of Elements
3. 57. 8. Require Both Elements or None
3. 57. 9. Requiring Elements in a Mixed Model
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