Ensemble de termes d'index

itermset =

(indexterm+)

indexterm =

(primary?, ((secondary, ((tertiary, (see | seealso+)?) | see | seealso+)?) | see | seealso+)?)

primary =

(

ndxterm.char.mix)*

secondary =

(

ndxterm.char.mix)*

tertiary =

(

ndxterm.char.mix)*

see =

(

ndxterm.char.mix)*

seealso =

(

ndxterm.char.mix)*

visites