Read-Write rules for table cell rotation

[Roger Shuttleworth]

Hello All

FM 11.0.1 structured, using DITA 1.2.

I'm hoping some read-write rules guru will be able point me in the right 
direction...

We have some tables in which occasional cell contents are rotated. To do 
this manually, we select the text and go to the Graphics menu. But since 
we are using DITA XML, I'd like to save the rotation property to the XML 
and have FM apply it again when the XML file is reopened. Clearly a job 
for read-write rules.

So after a thorough study of the Structured Application Developer's 
Guide and the corresponding Reference, as well as the FM11 help, etc., I 
have attempted with the following:

element "entry" {
     is fm table cell element;
     attribute "outputclass" {
         is fm property rotate;
         value "rotate" is fm value "270";
         }
     }

When I set @outputclass to "rotate" and save as XML, the attribute value 
is not written. If I edit the XML in a text editor and then open in FM, 
the @outputclass is set to "no value". So clearly nothing is happening 
using @outputclass and/or my rule.

The Developer Reference gives tantalizing information such as 
"FrameMaker extends the possible values to allow rotations of 0, 90,  
80, and 270 degrees." I've tried a whole lot of alternative rules and 
values, but nothing seems to do anything (except generate an error, that 
is).

Do I need to use or define a different attribute than @outputclass? Or 
is there some other secret syntax that eludes me? Or does it just not work?

Thanks for your help..

Roger Shuttleworth
London, Canada