other,5-1-P06-1018,bq | This paper proposes a generic <term> mathematical formalism </term> for the combination of various <term> structures </term> : <term> strings </term> , <term> trees </term> , <term> dags </term> , <term> graphs </term> , and products of them . | #11050 This paper proposes a genericmathematical formalism for the combination of various structures: strings, trees, dags, graphs, and products of them. |