Use W3C documentation for the XHTML1.1 table model. (http://www.w3.org/TR/xhtml-modularization/abstract_modules.html#s_tablemodule)
The name for the <colgroup> element in tables.
The XHTML 1.1 Table Tag Set should provide a .qname parameter entity for each element, so the name can be easily customized.
<!ENTITY % colgroup.qname "colgroup" >
JATS-XHTMLtablesetup0.ent