5.25 http://schemas.microsoft.com/office/drawing/2016/11/main Schema

 <xsd:schema targetNamespace="http://schemas.microsoft.com/office/drawing/2016/11/main" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns="http://schemas.microsoft.com/office/drawing/2016/11/main">
   <xsd:import schemaLocation="orel.xsd" namespace="http://schemas.openxmlformats.org/officeDocument/2006/relationships"/>
   <xsd:complexType name="CT_PictureAttributionSourceURL">
     <xsd:attribute ref="r:id" use="required"/>
   </xsd:complexType>
   <xsd:element name="picAttrSrcUrl" type="CT_PictureAttributionSourceURL"/>
 </xsd:schema>