DSSSL Example:

(element H1 
    (make paragraph 
        font-size: (* 1.5 (inherited-font-size))
        space-before: 2.5em
        space-after: 1.5em
        escapement-space-after: 0.1em
        font-weight: 'bold
        (uppercase) ))

(element H2
    (make paragraph
        font-size: (* 1.3 (inherited-font-size))
        space-before: 1.5em
        space-after: 1em
        font-weight: 'bold))

(element H3 
    (make paragraph 
        font-size: (* 1.3 (inherited-font-size))
        space-before: 1em
        space-after: 0.25em
        font-weight: 'bold))