2.2.9 pPr Extensions
Any pPr element specified in [ISO/IEC29500-1:2016] section 17.7.5.2 is extended by the addition of the following element; collapsed.<8> To maintain compatibility with ISO/IEC-29500 implementations, the element’s namespace prefix MUST be specified in an Ignorable attribute ([ISO/IEC29500-3:2015] section 7.2).