Requires the elements in the group to appear in the specified sequence within the containing element.
<sequence
  id = ID 
  maxOccurs = (nonNegativeInteger | unbounded) : 1 
  minOccurs = nonNegativeInteger : 1 
  {any attributes with non-schema Namespace}…>
Content: (annotation?, (element | group | choice | sequence | any)*)
</sequence>
Optional.
Optional.
Optional.
| Number of occurrences | One time within group; otherwise, unlimited. | 
| Parent elements | group, choice, sequence, complexType, restriction (simpleContent), extension (simpleContent), restriction (complexContent), extension (complexContent) | 
| Contents | annotation, any, choice, element, group, sequence | 
The following example shows an element (zooAnimals) that can have zero or more of the following elements, elephant, bear, giraffe, in the sequence element.
<xs:element name="zooAnimals">
      <xs:complexType>
            <xs:sequence minOccurs="0" maxOccurs="unbounded">
               <xs:element name="elephant"/>
               <xs:element name="bear"/>
               <xs:element name="giraffe"/>
            </xs:sequence>
      </xs:complexType>
</xs:element>
XML Schema Reference (XSD) | XML Schema Elements
For more information, see the W3C XML Schema Part 1: Structures Recommendation at http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#element-sequence.