Use W3C documentation for the XHTML1.1 table model. (http://www.w3.org/TR/xhtml-modularization/abstract_modules.html#s_tablemodule)
Groups several attributes that affect horizontal alignment, for use in the attribute lists of several elements.
<!ENTITY % CellHAlign.attrib "align ( left | center | right | justify | char ) #IMPLIED char %Character.datatype; #IMPLIED charoff %Length.datatype; #IMPLIED" >
align ( left | center | right | justify | char ) #IMPLIED char CDATA #IMPLIED charoff CDATA #IMPLIED
JATS-xhtml-table-1.mod