startspan and endspan
<!ELEMENT atipl:startspan EMPTY>
<!ATTLIST atipl:startspan
number NMTOKEN #IMPLIED
columns NMTOKEN #IMPLIED
%commonattrs; >
<!ELEMENT atipl:endspan EMPTY>
<!ATTLIST atipl:endspan
%commonattrs; >
The start and end of a spanned column are specified by the startspan and endspan markup. For example, a page that contains two columns of text followed by a page wide table will consist of two spans. The span number, which is reset on every page, is indicated by the attribute number. The number of columns is indicated by columns.