Re: (dsssl) Comparing style sheet languages

["Christopher R. Maden" <crism@xxxxxxxxx>]

At 06:15 26/6/02, Håkon Wium Lie wrote:
> I'm putting together a page to compare various style sheet languages.
>
>   http://people.opera.com/howcome/2002/style/chart.html
>
> The purpose of this message is to ask for help filling in the empty
> cells in teh DSSSL column. Also, and other comments, corrections or
> contributions you may have is welcome.

===
I believe that the code for doubling H1's size is correct.

===
To increase it by 4 pt, try (+ 4pt (inherited-font-size)).

===
For doubling the base size, I would use a variable rather than defining the 
em unit:

(define base-size 12pt)

(element H1
  (make paragraph
        font-size: (* 2 base-size)))

===
To find <li> with <ol> ancestor, you need conditionals like P:

(element LI
  (if (not (node-list-empty? (ancestor "OL")))
    ...
    ...))

===
Similarly for P as the first child:

(element P
  (if (absolute-first-sibling? (current-node))
    ...
    ...))

===
... and as the first child of its type:

(element P
  (if (first-sibling? (current-node))
    ...
    ...))

===
For testing attribute existence:

(element NOTE
  (if (not (node-list-empty? (attribute "WARNING")))
    ...
    ...))

===
Selecting odd-numbered elements

(element TR
  (if (= (modulo (child-number) 2)
         0)
    ...   ;even-row
    ...)) ;odd-row

===
The base unit for DSSSL is the meter, m.  Pre-defined derived units are:

(define-unit cm 0.01m)
(define-unit mm 0.001m)
(define-unit in 0.0254m)
(define-unit pt 0.0003527778m)
(define-unit pica 0.004233333m)

DSSSL also supports angular measurement, specified in radians.  DSSSL does 
not support relative lengths *as units* - the inherited values can be used 
in most cases for that behavior.

===

More later, or maybe someone else will get to it first.  I'm hungry now. (-:

~Chris
--
Christopher R. Maden, Principal Consultant, crism consulting
DTDs/schemas - conversion - ebooks - publishing - Web - B2B - training
<URL: http://crism.maden.org/consulting/ >
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