cannot merge/split table cells

Hi,
I cannot merge/split table cells as the entries in the context menu are always disabled. However, I'm able to convert a td to th, or to insert new rows/columns.

Here is an excerpt of my role-mapping:
<roleMapping xmlns:xhtml="http://www.w3.org/1999/xhtml">
<element name="xhtml:table" role="table" />
<attribute name="border" role="tableborder" />
<element name="xhtml:tbody" role="tablerowcontainer" />
<element name="xhtml:tbody" role="tablebody" />
<element name="xhtml:tfoot" role="tablefooter" />
<element name="xhtml:tr" role="tablerow" />
<element name="xhtml:tr" role="tablecellcontainer" />
<element name="xhtml:th" role="tableheadercell" />
<element name="xhtml:td" role="tablecell" />
<element name="xhtml:caption" role="tablecaption" />
<attribute name="rowspan" role="cellrowspan" />
<attribute name="colspan" role="cellcolspan" />
<attribute name="cellspacing" role="tablecellspacing" />
<attribute name="cellpadding" role="tablecellpadding" />
<attribute name="color" role="color" />
</roleMapping>

I also tried to prepend the xhtml prefix to the attributes:
<attribute name="xhtml:rowspan" role="cellrowspan" />

but it didn't make a difference.
any ideas?

(using Xopus 3.2.10)

Thanks.

The problem is that the default namespace is assigned to the xopus config namespace. So attribute name="rowspan" means the attribute rowspan in the xopus config namespace.

The only way to fix this is to assign a prefix to the xopus config namespace, as undeclaring the default namespace (xmlns="") doesn't work in MSXML.