XEP [XEP] provides two mechanisms for overriding its default mappings from FO to Structure Element name. The default mappings of each FO type to a Structure Element name may be overridden by specifying a custom rolemap.xml file. Individual FOs may have the default mapping overridden using the rx:pdf-structure-tag extension attribute. The allowed values are ‘H1’, ‘H2’, ‘H3’, ‘H4’, ‘H5’, ‘H6’, ‘P’ , ‘TH’, ‘TR’ and ‘Artifact’. When the rx:pdf-structure-tag value is ‘Artifact’, an additional rx:artifact-type attribute may be specified. Its allowed values are ‘Pagination’, ‘Page’ and ‘Layout’. When the rx:artifact-type value is ‘Pagination’, an additional rx:artifact-type attribute may be specified. Its allowed values are ‘Header’, ‘Footer’ and ‘Watermark’.