5.6 http://schemas.microsoft.com/office/drawing/2008/diagram Schema

 <xsd:schema targetNamespace="http://schemas.microsoft.com/office/drawing/2008/diagram" elementFormDefault="qualified" attributeFormDefault="unqualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:d="http://schemas.openxmlformats.org/drawingml/2006/diagram" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns="http://schemas.microsoft.com/office/drawing/2008/diagram">
   <xsd:import schemaLocation="igxelementpropertyset.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/diagram"/>
   <xsd:import schemaLocation="oartspstyle.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/main"/>
   <xsd:import schemaLocation="oartdocprop.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/main"/>
   <xsd:import schemaLocation="oarte2o.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/main"/>
   <xsd:import schemaLocation="oarttx.xsd" namespace="http://schemas.openxmlformats.org/drawingml/2006/main"/>
   <xsd:import schemaLocation="orel.xsd" namespace="http://schemas.openxmlformats.org/officeDocument/2006/relationships"/>
   <xsd:complexType name="CT_ShapeNonVisual">
     <xsd:sequence>
       <xsd:element name="cNvPr" type="a:CT_NonVisualDrawingProps" minOccurs="1" maxOccurs="1"/>
       <xsd:element name="cNvSpPr" type="a:CT_NonVisualDrawingShapeProps" minOccurs="1" maxOccurs="1"/>
     </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="CT_Shape">
     <xsd:sequence>
       <xsd:element name="nvSpPr" type="CT_ShapeNonVisual" minOccurs="1" maxOccurs="1"/>
       <xsd:element name="spPr" type="a:CT_ShapeProperties" minOccurs="1" maxOccurs="1"/>
       <xsd:element name="style" type="a:CT_ShapeStyle" minOccurs="0" maxOccurs="1"/>
       <xsd:element name="txBody" type="a:CT_TextBody" minOccurs="0" maxOccurs="1"/>
       <xsd:element name="txXfrm" type="a:CT_Transform2D" minOccurs="0" maxOccurs="1"/>
       <xsd:element name="extLst" type="a:CT_OfficeArtExtensionList" minOccurs="0" maxOccurs="1"/>
     </xsd:sequence>
     <xsd:attribute name="modelId" type="d:ST_ModelId" use="required"/>
   </xsd:complexType>
   <xsd:complexType name="CT_GroupShapeNonVisual">
     <xsd:sequence>
       <xsd:element name="cNvPr" type="a:CT_NonVisualDrawingProps" minOccurs="1" maxOccurs="1"/>
       <xsd:element name="cNvGrpSpPr" type="a:CT_NonVisualGroupDrawingShapeProps" minOccurs="1" maxOccurs="1"/>
     </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="CT_GroupShape">
     <xsd:sequence>
       <xsd:element name="nvGrpSpPr" type="CT_GroupShapeNonVisual" minOccurs="1" maxOccurs="1"/>
       <xsd:element name="grpSpPr" type="a:CT_GroupShapeProperties" minOccurs="1" maxOccurs="1"/>
       <xsd:choice minOccurs="0" maxOccurs="unbounded">
         <xsd:element name="sp" type="CT_Shape"/>
         <xsd:element name="grpSp" type="CT_GroupShape"/>
       </xsd:choice>
       <xsd:element name="extLst" type="a:CT_OfficeArtExtensionList" minOccurs="0" maxOccurs="1"/>
     </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="CT_Drawing">
     <xsd:sequence>
       <xsd:element name="spTree" type="CT_GroupShape" minOccurs="1" maxOccurs="1"/>
     </xsd:sequence>
   </xsd:complexType>
   <xsd:element name="drawing" type="CT_Drawing"/>
   <xsd:complexType name="CT_DataModelExtBlock">
     <xsd:attribute name="relId" type="xsd:string"/>
     <xsd:attribute name="minVer" type="xsd:anyURI"/>
   </xsd:complexType>
   <xsd:element name="dataModelExt" type="CT_DataModelExtBlock"/>
 </xsd:schema>