7.4 http://schemas.microsoft.com/2003/10/Serialization/Arrays Schema

 <?xml version="1.0" encoding="UTF-8"?>
 <xs:schema xmlns:q2="http://schemas.microsoft.com/2003/10/Serialization/Arrays" elementFormDefault="qualified" targetNamespace="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:complexType name="ArrayOfstring">
     <xs:sequence>
       <xs:element minOccurs="0" maxOccurs="unbounded" name="string" nillable="true" type="xs:string"/>
     </xs:sequence>
   </xs:complexType>
   <xs:element name="ArrayOfstring" nillable="true" type="q2:ArrayOfstring"/>
 </xs:schema>