17.4.5 Assigning attributes other than ID to DocBook elements
You can include non-ID attributes in a DocBook block or inline element by assigning attribute="value" pairs to the FrameMaker format mapped to the element. The attributes you assign with configuration settings apply to all instances of the element in question. Only those attributes assigned to elements mapped from paragraph formats can be overridden with markers; attributes of elements mapped from character formats cannot be overridden with markers.
§17.4.5.1 Specifying attribute values for a block element or ancestor
§17.4.5.2 Specifying attribute values for an inline element
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