2.2 Extensions
Extensions are specified by using the conventions provided by Office Open XML file formats as specified in [ISO/IEC29500-3:2015].The following namespaces are utilized by the extensions specified in this document:
"http://schemas.microsoft.com/office/drawingml/2010/slicer"<1>
"http://schemas.microsoft.com/office/spreadsheetml/2009/9/main"<2>
"http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac"<3>
"http://schemas.microsoft.com/office/excel/2006/main"
"http://schemas.microsoft.com/office/spreadsheetml/2010/11/main"<4>
"http://schemas.microsoft.com/office/drawing/2012/timeslicer"<5>