5.30 http://schemas.microsoft.com/office/drawing/2016/12/diagram Schema

 <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://schemas.microsoft.com/office/drawing/2016/12/diagram" xmlns="http://schemas.microsoft.com/office/drawing/2016/12/diagram" elementFormDefault="qualified" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main">
   <xsd:import schemaLocation="oartspproperties.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/main"/>
   <xsd:import schemaLocation="oarttx.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/main"/>
   <xsd:element name="spPr" type="a:CT_ShapeProperties"/>
   <xsd:element name="lstStyle" type="a:CT_TextListStyle"/>
 </xsd:schema>