const unsigned short ALWAYS_SORTED = 1; 

attribute DOMString id; 

attribute DOMString label; 

const unsigned short NATURAL_SORT = 0; 

const unsigned short NEVER_SORTED = 0; 

attribute boolean primary; 

const unsigned short SOMETIMES_SORTED = 2; 

const unsigned short SORC_DESCENDING = 2; 

const unsigned short SORT_ASCENDING = 1; 

attribute unsigned short sortable; 

attribute unsigned short sortDirection; 

attribute DOMString type;