5.26 http://schemas.microsoft.com/office/drawing/2016/11/diagram Schema

 <xsd:schema targetNamespace="http://schemas.microsoft.com/office/drawing/2016/11/diagram" xmlns="http://schemas.microsoft.com/office/drawing/2016/11/diagram" xmlns:dgm="http://schemas.openxmlformats.org/drawingml/2006/diagram" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
   <xsd:import schemaLocation="igxtypes.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/diagram"/>
   <xsd:import schemaLocation="oarttxbullet.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/main"/>
   <xsd:simpleType name="ST_STorageType">
     <xsd:restriction base="xsd:token">
       <xsd:enumeration value="sibTrans"/>
       <xsd:enumeration value="parTrans"/>
     </xsd:restriction>
   </xsd:simpleType>
   <xsd:complexType name="CT_DiagramAutoBullet">
     <xsd:group ref="a:EG_TextBullet" minOccurs="1" maxOccurs="1"/>
     <xsd:attribute name="prefix" type="xsd:string" use="optional"/>
     <xsd:attribute name="leadZeros" type="xsd:boolean" use="optional"/>
   </xsd:complexType>
   <xsd:complexType name="CT_NumberDiagramInfo">
     <xsd:sequence>
       <xsd:element name="buPr" type="CT_DiagramAutoBullet" minOccurs="1" maxOccurs="1"/>
     </xsd:sequence>
     <xsd:attribute name="lvl" type="xsd:unsignedInt" use="required"/>
     <xsd:attribute name="ptType" type="ST_STorageType" use="required"/>
   </xsd:complexType>
   <xsd:complexType name="CT_NumberDiagramInfoList">
     <xsd:sequence>
       <xsd:element name="autoBuNodeInfo" type="CT_NumberDiagramInfo" minOccurs="0" maxOccurs="unbounded"/>
     </xsd:sequence>
   </xsd:complexType>
   <xsd:element name="autoBuNodeInfoLst" type="CT_NumberDiagramInfoList"/>
 </xsd:schema>