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<any> element is used to extend the XSD functionality. It is used to extend a complexType element defined in one XSD by an element which is not defined in the schema.

Consider an example − person.xsd has defined person complexType element. address.xsd has defined address complexType element.

person.xsd

<?xml version = "1.0" encoding = "UTF-8"?>
<xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema"
   targetNamespace = "https://www.adglob.in"
   xmlns = "https://www.adglob.in"
   elementFormDefault = "qualified">
   
   <xs:element name = "person">
      <xs:complexType >
         <xs:sequence>
            <xs:element name = "firstname" type = "xs:string"/>
            <xs:element name = "lastname" type = "xs:string"/>
            <xs:element name = "nickname" type = "xs:string"/>     
         </xs:sequence>
      </xs:complexType>
   </xs:element>
	
</xs:schema>	

address.xsd

<?xml version = "1.0" encoding = "UTF-8"?>
<xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema"
   targetNamespace = "https://www.adglob.in"
   xmlns = "https://www.adglob.in"
   elementFormDefault = "qualified">
   
   <xs:element name = "address">
      <xs:complexType>
         <xs:sequence>
            <xs:element name = "houseNumber" type = "xs:string"/>
            <xs:element name = "street" type = "xs:string"/>
            <xs:element name = "state" type = "xs:string"/>    
            <xs:element name = "zipcode" type = "xs:integer"/>   	  
         </xs:sequence>
      </xs:complexType>
   </xs:element>

</xs:schema>

If we want to define a person with address in XML, then the following declaration will be invalid.

person.xml

<?xml version = "1.0"?>
<class xmlns = "http://adglob,in"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "https://www.adglob.in person.xsd
   http://www.tutorialspoint.com address.xsd">  

   <person>
      <firstname>Dinkar</firstname>
      <lastname>Kad</lastname>
      <nickname>Dinkar</lastname>
   
      <address>
         <houseNumber>101</firstname>
         <street>Sector-1,Patiala</lastname>
         <state>Punjab</lastname>
         <zipcode>301202<zipcode>
      </address>
   
   </person>
	
</class>

Use <xs:any>

In order to validate above person.xml, add <xs:any> to person element in person.xsd.

person.xsd

<?xml version = "1.0" encoding = "UTF-8"?>
<xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema"
   targetNamespace = "http://adgob.in"
   xmlns = "https://www.adglob.in"
   elementFormDefault = "qualified">

   <xs:element name = "person">
      <xs:complexType >
         <xs:sequence>
            <xs:element name = "firstname" type = "xs:string"/>
            <xs:element name = "lastname" type = "xs:string"/>
            <xs:element name = "nickname" type = "xs:string"/>   
            <xs:any minOccurs = "0"/>		 
         </xs:sequence>
      </xs:complexType>
   </xs:element>
	
</xs:schema>

Now person.xml will be validated against person.xsd and address.xsd.