Method parseElements

Parse an element-content model. [42] elements ::= (choice | seq) ('?' | ' ' | '+')? [44] cps ::= S? %cp S? [45] choice ::= '(' S? %ctokplus (S? '|' S? %ctoks) S? ')' [46] ctokplus ::= cps ('|' cps)+ [47] ctoks ::= cps ('|' cps) [48] seq ::= '(' S? %stoks (S? ',' S? %stoks) S? ')' [49] stoks ::= cps

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