16.4.5.2 Specifying attribute values for an inline element
To apply attributes (other than id) to an inline element, assign attribute="value" pairs, separated by spaces, to the character format(s) mapped to the element:
; Frame char format (wildcards OK) = attributes
CharFmt = attribute1="value1" attribute2="value2" ...
You cannot use markers to override settings in [DocBookCharAttributes].
> 16 Producing DocBook XML > 16.4 Configuring DocBook elements > 16.4.5 Assigning attributes other than ID to DocBook elements > 16.4.5.2 Specifying attribute values for an inline element