17.4.5.2 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:

[DocBookCharAttributes]

; Frame char format (wildcards OK) = attributes

CharFmt = attribute1="value1" attribute2="value2" ...

You cannot use markers to override settings in [DocBookCharAttributes].