2.3.1.2 compatExt
Target namespace: http://schemas.microsoft.com/office/drawing/2010/main
A CT_CompatExt element that specifies a legacy drawing object. The legacy drawing object MUST be a form control or a legacy OLE or ActiveX control object.
The application can delete this legacy shape when loading.<42>
See section 2.2.6 for how this element integrates with the Open XML file formats -as specified in [ISO/IEC29500-1:2016].
The following W3C XML Schema ([XMLSCHEMA1/2] section 2.1) fragment specifies the contents of this element.
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<xsd:element name="compatExt" type="CT_CompatExt"/>
See section 5.1 for the full W3C XML Schema ([XMLSCHEMA1/2] section 2.1).