2.2.4 p and tr Extensions
Any p element (as specified in [ISO/IEC29500-1:2016] section 17.3.1.22) or tr element (specified in [ISO/IEC29500-1:2016] section 17.4.78) is extended by the addition of any of the following attributes: paraId, textId. Any p element (as specified in [ISO/IEC29500-1:2016] section 17.3.1.22) is extended by the addition of the following attribute: noSpellErr. To maintain compatibility with ISO/IEC-29500 implementations, the attribute’s namespace prefix MUST be specified in an Ignorable attribute ([ISO/IEC29500-3:2015] section 7.2).