Elements that will be used to contain the rows and columns inside
the <table-wrap> element. The following elements have been set up for inclusion: the XHTML table model <table> element.
In the original draft of this DTD, the OASIS Exchange Table model was also included and some NLM Tag Set supersets choose
to use this model instead of or in addition to the XHTML table model.
<!ENTITY % table.class "table" >