Column/row spans in tables

[jasom]

I'm writing a reStructuredText to common-doc converter, and it appears that there is no way to represent cells that span columns or rows. Is there any possibility of something like this being added?

[jasom]

Another glaring missing feature is column-headers, but at least including the header as an unstyled row works fine.

[eudoxia0]

Well strictly speaking column headers are defined as classes but currently none of the markup languages have syntax for them.

Also yeah column spans should be able to me modeled in CommonDoc 😞 the class hierarchy I thought up just handles the most basic form of tables as basic grids.