xs : maxLength, xs : minLength : Restrict the number of characters in string type

<xs:maxLength> defines maximum length of characters.

<xs:minLength> defines minimum length of characters.

<!-- validate pin -->

        <xs:element name="pin">

            <xs:simpleType>

                <xs:restriction base="xs:string">

                    <xs:minLength value="5" />

                    <xs:maxLength value="8" />

                </xs:restriction>

            </xs:simpleType>

        </xs:element>

As per above snippet, pin can have characters of length 5 to 8.

employee.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <!-- Schema for simple elements -->
        <xs:element name="id" type="xs:integer" />
  <xs:element name="firstname" type="xs:string" />
  <xs:element name="middlename" type="xs:string" />
  <xs:element name="lastname" type="xs:string" />
        <xs:element name="salary" type="xs:decimal" />
        <xs:element name="married" type="xs:string" />
        <xs:element name="department" type="xs:string" />
        <xs:element name="pjtname" type="xs:string" />
  <xs:element name="from" type="xs:date" />
  <xs:element name="to" type="xs:date" />

        <xs:element name="city" type="xs:string" />
        <xs:element name="district" type="xs:string" />
        <xs:element name="state" type="xs:string" />
        <xs:element name="country" type="xs:string" />

        <!-- validate pin -->
        <xs:element name="pin">
            <xs:simpleType>
                <xs:restriction base="xs:string">
                    <xs:minLength value="5" />
                    <xs:maxLength value="8" />
                </xs:restriction>
            </xs:simpleType>
        </xs:element>

        <!-- validate sex -->
        <xs:element name="sex">
            <xs:simpleType>
                <xs:restriction base="xs:string">
                    <xs:enumeration value="male" />
                    <xs:enumeration value="female" />
                </xs:restriction>
            </xs:simpleType>
        </xs:element>

        <!-- Applying restriction on Employee age -->
        <xs:element name="age">
            <xs:simpleType>
                <xs:restriction base="xs:integer">
                    <xs:minInclusive value="19" />
                    <xs:maxExclusive value="56" />
                </xs:restriction>
            </xs:simpleType>
        </xs:element>
        
  <!-- Schema for element details -->
  <xs:element name="details">
    <xs:complexType>
      <xs:sequence>
                            <xs:element ref="firstname" />
                            <xs:element ref="middlename" />
                            <xs:element ref="lastname" />
                            <xs:element ref="age" />
                            <xs:element ref="salary" />
                            <xs:element ref="married" />
                            <xs:element ref="sex" />
                            <xs:element ref="address" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>

        <!-- schema for address -->
        <xs:element name="address">
            <xs:complexType>
                <xs:sequence>
                    <xs:element ref="city" />
                    <xs:element ref="district" />
                    <xs:element ref="state" />
                    <xs:element ref="country" />
                    <xs:element ref="pin" />
                </xs:sequence>
            </xs:complexType>
        </xs:element>

         <!-- Schema for element project -->
  <xs:element name="project">
    <xs:complexType>
      <xs:sequence>
                            <xs:element ref="department" />
                            <xs:element ref="pjtname" />
                            <xs:element ref="from" />
                            <xs:element ref="to" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>

         <!-- Schema for element employee -->
  <xs:element name="employee">
    <xs:complexType>
      <xs:sequence>
                            <xs:element ref="id" />
                            <xs:element ref="details" />
                            <xs:element ref="project" maxOccurs="unbounded" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>

          <!-- Schema for element employees -->
  <xs:element name="employees">
    <xs:complexType>
      <xs:sequence>
                            <xs:element ref="employee" maxOccurs="unbounded" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  
</xs:schema>

employee.xml

<?xml version="1.0" encoding="UTF-8"?>
   
<employees xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:noNamespaceSchemaLocation="employees.xsd">

    <employee>
        <id>1</id>
        <details>
            <firstname>Hari</firstname>
            <middlename>Krishna</middlename>
            <lastname>Gurram</lastname>
            <age>25</age>
            <salary>80000</salary>
            <married>single</married>
            <sex>male</sex>
            <address>
                <city>Ongole</city>
                <district>prakasam</district>
                <state>Andhra Pradesh</state>
                <country>India</country>
                <pin>523169</pin>
            </address>
        </details>

        <project>
            <department>aero</department>
            <pjtname>Flight Controls</pjtname>
            <from>2011-09-16</from>
            <to>2013-01-22</to>
        </project>

        <project>
            <department>banking</department>
            <pjtname>Online Transaction Processing System</pjtname>
            <from>2013-01-23</from>
            <to>2014-10-06</to>
        </project>

        <project>
            <department>mobile</department>
            <pjtname>Daily News Application</pjtname>
            <from>2014-10-07</from>
            <to>2015-05-06</to>
        </project>
    </employee>
</employees>

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