List styles

Dear TC members,

I did some investigations for list styles.

First of all I checked how a list styles can be switched off in a style 
derived from a style that specifies a list style. It seems to me that 
this is not possible at the moment. There is no attribute to do so, nor 
can the style:list-style-name attribute be empty. Interestingly, the 
OpenOffice.org application in fact has the issue that one may switch of 
a list style in the UI for paragraph styles, but this situation 
currently is lost when saving and reloading a file.

To resolve this issue in our specification, we either
a) could allow a style:list-style-name to be empty, or
b) we could add an attribute similar to the "text:enable-numbering" we 
discussed last week, that in fact may have a better name.

I personally would prefer solution a) here.

We remaining issue is: If a graphic style contains a list style, and if 
this list style is switched off in a derived style, can this style by 
switched on in a further derived style again, and if so how. The 
following solution came into my mind here:

c) The derived style may contain an empty <text:list-style> element. If 
it is present, all style settings are inherited from the ancestor style 
that defines a list style already.
d) The list style can be referenced by a "special" value of the 
"style:list-style-name" attribute, like "*".
e) The list style can be referenced by a "special" value of the 
"style:list-style-name" attribute, like "*", and in addition to this, 
the embedded list style in general will only be evaluated if a 
"style:list-style-name" attribute is present.
f) like a), that is, we add an attribute similar to the 
"text:enable-numbering".

Best regards

Michael