<prstGeom> (Preset geometry)
This element specifies when a preset geometric shape should be used instead of a custom geometric shape. The generating application should be able to render all preset geometries enumerated in the <ST_ShapeType> list.
<p:sp>
  <p:nvSpPr>
    <p:cNvPr id="4" name="My Preset Shape"/>
    <p:cNvSpPr/>
    <p:nvPr/>
  </p:nvSpPr>
  <p:spPr>
    <a:xfrm>
      <a:off x="1981200" y="533400"/>
      <a:ext cx="1143000" cy="1066800"/>
    </a:xfrm>
    <a:prstGeom prst="heart">
    </a:prstGeom>
  </p:spPr>
</p:sp>

The output shape rendered by this DrawingML is shown above. ]
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Specifies the preset geometry that will be used for this shape. This preset can have any of the values in the enumerated list for  
<p:sp>
  <p:nvSpPr>
    <p:cNvPr id="4" name="Sun 3"/>
    <p:cNvSpPr/>
    <p:nvPr/>
  </p:nvSpPr>
  <p:spPr>
    <a:xfrm>
      <a:off x="1981200" y="533400"/>
      <a:ext cx="1143000" cy="1066800"/>
    </a:xfrm>
    <a:prstGeom prst="sun">
    </a:prstGeom>
  </p:spPr>
</p:sp>
In the above example a preset geometry has been used to define a shape. The shape utilized here is the sun shape. ] The possible values for this attribute are defined by the ST_ShapeType simple type (§5.1.12.56).  | 
The following XML Schema fragment defines the contents of this element:
<complexType name="CT_PresetGeometry2D">
	<sequence>
	<element name="avLst" type="CT_GeomGuideList" minOccurs="0" maxOccurs="1"/>
	</sequence>
	<attribute name="prst" type="ST_ShapeType" use="required"/>
</complexType>