When you map paragraph formats to DocBook elements, you must ensure that the element mapped to is allowed to contain text.
§17.4.2.1 Assigning DocBook elements to paragraph formats
§17.4.2.2 Specifying a default element for unmapped paragraph formats
§17.4.2.3 Omitting invalid tags for default DocBook block elements
§17.4.2.4 Overriding element mapping for paragraph formats
§17.4.2.5 Providing aliases for paragraph formats