Purpose	This element (the "sequence" particle) is used for expressing sequences in the content model of a complex type used for element definitions. This means that the child elements must appear in a given order.
Parent element	xs:choice, xs:complexType, xs:extension, xs:group, xs:sequence
Child elements	xs:any, xs:choice, xs:element, xs:group, xs:sequence
Attributes	minOccurs, maxOccurs
Status	Optional.

Attributes

Name	Type	Description
minOccurs	xs:nonNegativeInteger	Together with the maxOccurs attribute described below, this attribute expresses multiplicity in TSD (and XML Schema) in sequence elements within a content model. The value of a minOccurs attribute in an xs:sequence declaration determines the minimum number of occurrences of that sequence. The value of minOccurs must be a non-negative integer. The default value for minOccurs is 1.
maxOccurs	xs:nonNegativeInteger or "unbounded"	Together with the minOccurs attribute described above, this attribute expresses multiplicity in TSD (and XML Schema) in sequence elements within a content model. The value of a maxOccurs attribute in an xs:sequence declaration determines the maximum number of occurrences of that sequence. The value of maxOccurs must be a non-negative integer or the value "unbounded". The default value for maxOccurs is 1.

Example 1

In the following example, within a p_record element the five children from p_firstname to p_country must each appear exactly once in the order:

1. p_firstname

2. p_lastname

3. p_address

4. p_city

5. p_country

<xs:element name="p_record">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="p_firstname" type="xs:string"/>
      <xs:element name="p_lastname" type="xs:string"/>
      <xs:element name="p_address" type="xs:string"/>
      <xs:element name="p_city" type="xs:string"/>
      <xs:element name="p_country" type="xs:string"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

Example 2

This example illustrating the use of the xs:sequence element is taken from the "patient" schema:

  <xs:element name = "patient">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref = "name" minOccurs = "0"></xs:element>
        <xs:element ref = "sex"></xs:element>
        <xs:element ref = "born" minOccurs = "0"></xs:element>
        <xs:element ref = "address" minOccurs = "0"></xs:element>
        <xs:element ref = "occupation" minOccurs = "0"></xs:element>
        <xs:element ref = "insurance" minOccurs = "0"></xs:element>
        <xs:element ref = "nextofkin" minOccurs = "0"></xs:element>
        <xs:element ref = "submitted"></xs:element>
        <xs:element ref = "examination" minOccurs = "0"
                                        maxOccurs = "unbounded"></xs:element>
        <xs:element ref = "therapy" minOccurs = "0"></xs:element>
        <xs:element ref = "result" minOccurs = "0"></xs:element>
        <xs:element ref = "remarks" minOccurs = "0"
                                    maxOccurs = "unbounded"></xs:element>
      </xs:sequence>
      <xs:attribute name = "ID" type = "xs:string"></xs:attribute>
    </xs:complexType>
  </xs:element>

It shows a sequence with a list of optional elements and two required elements, i.e. sex and submitted.