5.11 http://schemas.microsoft.com/office/powerpoint/2017/10/main Schema

 <xsd:schema elementFormDefault="qualified" targetNamespace="http://schemas.microsoft.com/office/powerpoint/2017/10/main" xmlns="http://schemas.microsoft.com/office/powerpoint/2017/10/main" xmlns:p1710="http://schemas.microsoft.com/office/powerpoint/2017/10/main" xmlns:s="http://schemas.openxmlformats.org/officeDocument/2006/sharedTypes" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <xsd:complexType name="CT_ReadonlyRecommended">
     <xsd:attribute name="val" type="xsd:boolean" use="required"/>
   </xsd:complexType>
   <xsd:element name="readonlyRecommended" type="CT_ReadonlyRecommended"/>
 </xsd:schema>